167 relations: Abundance of the chemical elements, Abundances of the elements (data page), Actinide, Actinides in the environment, Actinocene, Allotropes of plutonium, Americium, Americium-241, Amtor, Asphalt, Atom, Atomic radii of the elements (data page), Atomic radius, Ausonium, Bananaman, Berkelium, Binary compounds of silicon, Bioremediation of radioactive waste, Bismuth, Bohemium, Boiling points of the elements (data page), Cavendish Laboratory, Chemical element, Chemical elements in East Asian languages, Chemistry: A Volatile History, Chernobyl disaster, Compounds of fluorine, CPK coloring, Curium, Deaths in August 2004, Decay chain, Densities of the elements (data page), Depleted uranium, Dubnium, Edwin McMillan, Einsteinium, Electrical resistivities of the elements (data page), Electron affinity (data page), Electron configuration, Electron configurations of the elements (data page), Electron shell, Electronegativities of the elements (data page), Emilio Segrè, Extended periodic table, Ferromagnetism, Fertile material, Fluoride volatility, Francium, Fritz Houtermans, Germanium, ..., Glenn T. Seaborg, Halogen, Heat capacities of the elements (data page), Heats of fusion of the elements (data page), Heats of vaporization of the elements (data page), Heavy metals, History of nuclear weapons, Index of chemistry articles, Inorganic compounds by element, Institutions in the Southern Victory Series, Ion exchange, Ionic radius, Ionization energies of the elements (data page), Island of stability, Isotopes of neptunium, Isotopes of nihonium, Isotopes of plutonium, Joseph W. Kennedy, Kurt Starke, Lawrence Berkeley National Laboratory, Liquid fluoride thorium reactor, Liquid–liquid extraction, List of acronyms: N, List of chemical element name etymologies, List of chemical elements, List of elements by atomic properties, List of elements by stability of isotopes, List of eponyms (L–Z), List of International Organization for Standardization standards, List of MeSH codes (D01), List of misidentified chemical elements, List of oxidation states of the elements, List of people whose names are used in chemical element names, List of places used in the names of chemical elements, List of Superfund sites in Kentucky, List of University of California, Berkeley alumni, List of world production, Major actinide, MAUD Committee, Mössbauer spectroscopy, Melting points of the elements (data page), Metal ions in aqueous solution, Metalloid, Minor actinide, Molar ionization energies of the elements, Naming of chemical elements, Neopentane, Neptune, Neptune (disambiguation), Neptunium(III) fluoride, Neptunium(IV) fluoride, Neptunium(V) fluoride, Neptunium(VI) fluoride, Neptunocene, Nicholas Kemmer, Nihonium, Norman Feather, NP, Nuclear chemistry, Nuclear decommissioning, Nuclear reprocessing, Nuclear transmutation, Organoneptunium chemistry, Otto Hahn, Oxohalide, Period (periodic table), Period 7 element, Periodic table, Periodic table (crystal structure), Philip Abelson, Photofission, Pirates of Venus, Pluto, Plutonium, Plutonium-238, Plutonium-241, Post-transition metal, Potential applications of graphene, Prices of elements and their compounds, Przybylski's Star, Pyrophoricity, Radon, Rare-earth element, Rhenium, Roles of chemical elements, S-50 (Manhattan Project), Savannah River Site, Science (journal), Sequanium, Spent nuclear fuel, Standard electrode potential (data page), Subterfuge (video game), Symbol (chemistry), Synthetic element, The Undying Fire (Pratt novel), Thermal conductivities of the elements (data page), Thorium, Timeline of chemical element discoveries, Timeline of chemistry, Timeline of the 20th century, Timeline of the San Francisco Bay Area, Trace radioisotope, Transuranium element, Trivial name, Tube Alloys, Université de Montréal, University of California, Berkeley, Uranium, Uranium dioxide, Uranocene, Vapor pressures of the elements (data page), Waste Isolation Pilot Plant, Yoshio Nishina, Yvette Cauchois, Zangger Committee, 1940 in science, 93 (number). Expand index (117 more) »
Abundance of the chemical elements
The abundance of the chemical elements is a measure of the occurrence of the chemical elements relative to all other elements in a given environment.
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Abundances of the elements (data page)
No description.
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Actinide
The actinide or actinoid (IUPAC nomenclature) series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.
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Actinides in the environment
Actinides in the environment refer to the sources, environmental behaviour and effects of actinides in Earth's environment.
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Actinocene
An actinocene is a type of metallocene compound that contains an element from the actinide series.
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Allotropes of plutonium
Plutonium occurs in a variety of allotropes, even at ambient pressure.
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Americium
Americium is a synthetic chemical element with symbol Am and atomic number 95.
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Americium-241
Americium-241 (241Am) is an isotope of americium.
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Amtor
The Amtor or Venus Series is a science fantasy series consisting of four novels and one novelette written by American author Edgar Rice Burroughs.
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Asphalt
Asphalt, also known as bitumen, is a sticky, black, and highly viscous liquid or semi-solid form of petroleum.
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Atom
An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
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Atomic radii of the elements (data page)
The atomic radius of a chemical element is the distance from the centre of the nucleus to the outermost shell of the electron.
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Atomic radius
The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding cloud of electrons.
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Ausonium
Ausonium (atomic symbol Ao) was the name assigned to the element with atomic number 93, now known as neptunium.
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Bananaman
Bananaman is a fictional character appearing in British comic books.
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Berkelium
Berkelium is a transuranic radioactive chemical element with symbol Bk and atomic number 97.
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Binary compounds of silicon
Binary compounds of silicon are binary chemical compounds containing silicon and one other chemical element.
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Bioremediation of radioactive waste
Bioremediation of radioactive waste or bioremediation of radionuclides is an application of bioremediation based on the use of biological agents bacteria, plants and fungi (natural or genetically modified) to catalyze chemical reactions that allow the decontamination of sites affected by radionuclides.
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Bismuth
Bismuth is a chemical element with symbol Bi and atomic number 83.
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Bohemium
Bohemium was the name assigned to the element with atomic number 93, now known as neptunium, when its discovery was first incorrectly alleged.
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Boiling points of the elements (data page)
No description.
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Cavendish Laboratory
The Cavendish Laboratory is the Department of Physics at the University of Cambridge, and is part of the School of Physical Sciences.
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Chemical element
A chemical element is a species of atoms having the same number of protons in their atomic nuclei (that is, the same atomic number, or Z).
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Chemical elements in East Asian languages
The names for chemical elements in East Asian languages, along with those for some chemical compounds (mostly organic), are among the newest words to enter the local vocabularies.
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Chemistry: A Volatile History
Chemistry: A Volatile History is a 2010 BBC documentary on the history of chemistry presented by Jim Al-Khalili.
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Chernobyl disaster
The Chernobyl disaster, also referred to as the Chernobyl accident, was a catastrophic nuclear accident.
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Compounds of fluorine
Fluorine forms a great variety of chemical compounds, within which it almost always adopts an oxidation state of −1.
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CPK coloring
In chemistry, the CPK coloring is a popular color convention for distinguishing atoms of different chemical elements in molecular models.
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Curium
Curium is a transuranic radioactive chemical element with symbol Cm and atomic number 96.
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Deaths in August 2004
The following is a list of notable deaths in August 2004.
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Decay chain
In nuclear science, the decay chain refers to a series of radioactive decays of different radioactive decay products as a sequential series of transformations.
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Densities of the elements (data page)
No description.
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Depleted uranium
Depleted uranium (DU; also referred to in the past as Q-metal, depletalloy or D-38) is uranium with a lower content of the fissile isotope U-235 than natural uranium.
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Dubnium
Dubnium is a synthetic chemical element with symbol Db and atomic number 105.
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Edwin McMillan
Edwin Mattison McMillan (September 18, 1907 – September 7, 1991) was an American physicist and Nobel laureate credited with being the first-ever to produce a transuranium element, neptunium.
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Einsteinium
Einsteinium is a synthetic element with symbol Es and atomic number 99.
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Electrical resistivities of the elements (data page)
As quoted at http://www.webelements.com/ from these sources.
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Electron affinity (data page)
This page deals with the electron affinity as a property of isolated atoms or molecules (i.e. in the gas phase).
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Electron configuration
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.
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Electron configurations of the elements (data page)
This page shows the electron configurations of the neutral gaseous atoms in their ground states.
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Electron shell
In chemistry and atomic physics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus.
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Electronegativities of the elements (data page)
No description.
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Emilio Segrè
Emilio Gino Segrè (1 February 1905 – 22 April 1989) was an Italian-American physicist and Nobel laureate, who discovered the elements technetium and astatine, and the antiproton, a subatomic antiparticle, for which he was awarded the Nobel Prize in Physics in 1959.
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Extended periodic table
An extended periodic table theorizes about elements beyond oganesson (beyond period 7, or row 7).
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Ferromagnetism
Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets.
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Fertile material
Fertile material is a material that, although not itself fissionable by thermal neutrons, can be converted into a fissile material by neutron absorption and subsequent nuclei conversions.
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Fluoride volatility
Fluoride volatility is the tendency of highly fluorinated molecules to vaporize at comparatively low temperatures.
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Francium
Francium is a chemical element with symbol Fr and atomic number 87.
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Fritz Houtermans
Friedrich Georg "Fritz" Houtermans (January 22, 1903 – March 1, 1966) was a Dutch-Austrian-German atomic and nuclear physicist born in Zoppot near Danzig, West Prussia to a Dutch father, who was a wealthy banker.
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Germanium
Germanium is a chemical element with symbol Ge and atomic number 32.
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Glenn T. Seaborg
Glenn Theodore Seaborg (April 19, 1912February 25, 1999) was an American chemist whose involvement in the synthesis, discovery and investigation of ten transuranium elements earned him a share of the 1951 Nobel Prize in Chemistry.
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Halogen
The halogens are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
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Heat capacities of the elements (data page)
No description.
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Heats of fusion of the elements (data page)
No description.
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Heats of vaporization of the elements (data page)
No description.
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Heavy metals
Heavy metals are generally defined as metals with relatively high densities, atomic weights, or atomic numbers.
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History of nuclear weapons
Nuclear weapons possess enormous destructive power from nuclear fission or combined fission and fusion reactions.
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Index of chemistry articles
Chemistry (from Egyptian kēme (chem), meaning "earth") is the physical science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions.
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Inorganic compounds by element
This is a list of common inorganic and organometallic compounds of each element.
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Institutions in the Southern Victory Series
The Southern Victory Series is a fan name given to a series of Harry Turtledove alternate history novels.
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Ion exchange
Ion exchange is an exchange of ions between two electrolytes or between an electrolyte solution and a complex.
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Ionic radius
Ionic radius, rion, is the radius of an atom's ion in ionic crystals structure.
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Ionization energies of the elements (data page)
No description.
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Island of stability
In nuclear physics, the island of stability is the prediction that a set of heavy nuclides with a near magic number of protons and neutrons will temporarily reverse the trend of decreasing stability in elements heavier than uranium.
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Isotopes of neptunium
Neptunium (93Np) is usually considered an artificial element, although trace quantities are found in nature, so thus a standard atomic weight cannot be given.
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Isotopes of nihonium
Nihonium (113Nh) is a synthetic element.
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Isotopes of plutonium
Plutonium (94Pu) is an artificial element, except for trace quantities resulting from neutron capture by uranium, and thus a standard atomic weight cannot be given.
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Joseph W. Kennedy
Joseph William Kennedy (May 30, 1916 – May 5, 1957) was an American chemist who was a co-discoverer of plutonium, along with Glenn T. Seaborg, Edwin McMillan and Arthur Wahl.
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Kurt Starke
Kurt Starke (1911 in Berlin – 19 January 2000) was a German radiochemist.
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Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory (LBNL), commonly referred to as Berkeley Lab, is a United States national laboratory located in the Berkeley Hills near Berkeley, California that conducts scientific research on behalf of the United States Department of Energy (DOE).
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Liquid fluoride thorium reactor
The liquid fluoride thorium reactor (acronym LFTR; often pronounced lifter) is a type of molten salt reactor.
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Liquid–liquid extraction
Liquid–liquid extraction (LLE), also known as solvent extraction and partitioning, is a method to separate compounds or metal complexes, based on their relative solubilities in two different immiscible liquids, usually water (polar) and an organic solvent (non-polar).
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List of acronyms: N
(Main list of acronyms).
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List of chemical element name etymologies
This is the list of etymologies for all chemical element names.
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List of chemical elements
, 118 chemical elements are identified.
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List of elements by atomic properties
This is a list of chemical elements and their atomic properties, ordered by Atomic number.
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List of elements by stability of isotopes
Atomic nuclei consist of protons and neutrons, which attract each other through the nuclear force, while protons repel each other via the electric force due to their positive charge.
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List of eponyms (L–Z)
An eponym is a person (real or fictitious) whose name has become identified with a particular object or activity.
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List of International Organization for Standardization standards
This is a list of publishedThis list generally excludes draft versions.
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List of MeSH codes (D01)
This is the fourth part of the list of the "D" codes for MeSH.
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List of misidentified chemical elements
Chemical elements that have been mistakenly "discovered".
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List of oxidation states of the elements
This is a list of known oxidation states of the chemical elements, excluding nonintegral values.
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List of people whose names are used in chemical element names
Below is the list of people whose names are used in chemical element names.
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List of places used in the names of chemical elements
40 of the 118 chemical elements have names associated with, or specifically named for, places around the world or among astronomical objects.
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List of Superfund sites in Kentucky
This is a list of Superfund sites in Kentucky designated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) environmental law.
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List of University of California, Berkeley alumni
This page lists notable alumni and students of the University of California, Berkeley.
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List of world production
This is a list of annual world production.
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Major actinide
Major actinides is a term used in the nuclear power industry that refers to the plutonium and uranium present in used nuclear fuel, as opposed to the minor actinides neptunium, americium, curium, berkelium, and californium.
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MAUD Committee
The MAUD Committee was a British scientific working group formed during the Second World War.
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Mössbauer spectroscopy
Mössbauer spectroscopy is a spectroscopic technique based on the Mössbauer effect.
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Melting points of the elements (data page)
No description.
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Metal ions in aqueous solution
A metal ion in aqueous solution (aqua ion) is a cation, dissolved in water, of chemical formula z+.
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Metalloid
A metalloid is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them.
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Minor actinide
The minor actinides are the actinide elements in used nuclear fuel other than uranium and plutonium, which are termed the major actinides.
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Molar ionization energies of the elements
These tables list values of molar ionization energies, measured in kJ mol−1.
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Naming of chemical elements
Chemical elements may be named from various sources: sometimes based on the person who discovered it, or the place it was discovered.
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Neopentane
Neopentane, also called 2,2-dimethylpropane, is a double-branched-chain alkane with five carbon atoms.
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Neptune
Neptune is the eighth and farthest known planet from the Sun in the Solar System.
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Neptune (disambiguation)
Neptune is a planet in the Solar System, named after Neptune (mythology), a god in Ancient Roman mythology.
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Neptunium(III) fluoride
Neptunium(III) fluoride or neptunium trifluoride is a chemical compound of neptunium and fluorine with the formula NpF3.
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Neptunium(IV) fluoride
Neptunium(IV) fluoride or neptunium tetrafluoride is a chemical compound of neptunium and fluorine with the formula NpF4.
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Neptunium(V) fluoride
Neptunium(V) fluoride or neptunium pentafluoride is a chemical compound of neptunium and fluorine with the formula NpF5.
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Neptunium(VI) fluoride
Neptunium hexafluoride (NpF6) is the highest fluoride of neptunium.
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Neptunocene
Neptunocene, Np(C8H8)2, is an organoneptunium compound composed of a neptunium atom sandwiched between two cyclooctatetraenide rings.
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Nicholas Kemmer
Prof Nicholas Kemmer, FRS FRSE (7 December 1911 – 21 October 1998), was a Russian-born nuclear physicist working in Britain, who played an integral and leading edge role in United Kingdom's nuclear programme, and was known as a mentor of Abdus Salam – a Nobel laureate in physics.
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Nihonium
Nihonium is a synthetic chemical element with symbol Nh and atomic number 113.
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Norman Feather
Norman Feather FRS FRSE PRSE (16 November 1904, Pecket Well, Yorkshire – 14 August 1978, Christie Hospital, Manchester), was an English nuclear physicist.
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NP
NP may refer to.
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Nuclear chemistry
Nuclear chemistry is the subfield of chemistry dealing with radioactivity, nuclear processes, such as nuclear transmutation, and nuclear properties.
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Nuclear decommissioning
Nuclear decommissioning is the process whereby a nuclear facility is dismantled to the point that it no longer requires measures for radiation protection.
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Nuclear reprocessing
Nuclear reprocessing technology was developed to chemically separate and recover fissionable plutonium from spent nuclear fuel.
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Nuclear transmutation
Nuclear transmutation is the conversion of one chemical element or an isotope into another chemical element.
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Organoneptunium chemistry
Organoneptunium chemistry is the chemical science exploring the properties, structure and reactivity of organoneptunium compounds, which are organometallic compounds containing a carbon to neptunium chemical bond.
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Otto Hahn
Otto Hahn, (8 March 1879 – 28 July 1968) was a German chemist and pioneer in the fields of radioactivity and radiochemistry.
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Oxohalide
Molecular oxohalides (oxyhalides) are a group of chemical compounds in which both oxygen and halogen atoms are attached to another chemical element A in a single molecule.
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Period (periodic table)
A period in the periodic table is a horizontal row.
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Period 7 element
A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the chemical elements.
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Periodic table
The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties, whose structure shows periodic trends.
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Periodic table (crystal structure)
For elements that are solid at standard temperature and pressure the table gives the crystalline structure of the most thermodynamically stable form(s) in those conditions.
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Philip Abelson
Philip Hauge Abelson (April 27, 1913 – August 1, 2004) was an American physicist, a scientific editor, and a science writer.
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Photofission
Photofission is a process in which a nucleus, after absorbing a gamma ray, undergoes nuclear fission (splits into two or more fragments).
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Pirates of Venus
Pirates of Venus is the first book in the Venus series (also called the "Carson Napier of Venus series") by American writer Edgar Rice Burroughs, the last major series in Burroughs's career (the other major series were Tarzan, Barsoom, and Pellucidar).
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Pluto
Pluto (minor planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune.
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Plutonium
Plutonium is a radioactive chemical element with symbol Pu and atomic number 94.
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Plutonium-238
Plutonium-238 (also known as Pu-238 or 238Pu) is a radioactive isotope of plutonium that has a half-life of 87.7 years.
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Plutonium-241
Plutonium-241 (Pu-241) is an isotope of plutonium formed when plutonium-240 captures a neutron.
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Post-transition metal
Post-transition metals are a set of metallic elements in the periodic table located between the transition metals to their left, and the metalloids to their right.
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Potential applications of graphene
Potential graphene applications include lightweight, thin, flexible, yet incredibly lightweight to, electric/photonics circuits, solar cells, and various medical, chemical and industrial processes enhanced or enabled by the use of new graphene materials.
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Prices of elements and their compounds
This table lists the elements by their name and gives some historical prices for them and their commonly traded compounds.
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Przybylski's Star
Przybylski's Star, or HD 101065, is a rapidly oscillating Ap star that is located at a distance of roughly from the Sun in the southern constellation of Centaurus.
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Pyrophoricity
A pyrophoric substance (from Greek πυροφόρος, pyrophoros, "fire-bearing") ignites spontaneously in air at or below 55 °C (130 °F).
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Radon
Radon is a chemical element with symbol Rn and atomic number 86.
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Rare-earth element
A rare-earth element (REE) or rare-earth metal (REM), as defined by IUPAC, is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium.
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Rhenium
Rhenium is a chemical element with symbol Re and atomic number 75.
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Roles of chemical elements
This table is designed to show the role(s) performed by each chemical element, in nature and in technology.
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S-50 (Manhattan Project)
The S-50 Project was the Manhattan Project's effort to produce enriched uranium by liquid thermal diffusion during World War II.
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Savannah River Site
The Savannah River Site (SRS) is a nuclear reservation in the United States in the state of South Carolina, located on land in Aiken, Allendale, and Barnwell counties adjacent to the Savannah River, southeast of Augusta, Georgia.
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Science (journal)
Science, also widely referred to as Science Magazine, is the peer-reviewed academic journal of the American Association for the Advancement of Science (AAAS) and one of the world's top academic journals.
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Sequanium
Sequanium was the proposed name for a new element found by the Romanian physicist Horia Hulubei in 1939.
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Spent nuclear fuel
Spent nuclear fuel, occasionally called used nuclear fuel, is nuclear fuel that has been irradiated in a nuclear reactor (usually at a nuclear power plant).
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Standard electrode potential (data page)
The data values of standard electrode potentials are given in the table below, in volts relative to the standard hydrogen electrode, and are for the following conditions.
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Subterfuge (video game)
Subterfuge is a real-time strategy video game developed by Ron Carmel and Noel Llopis.
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Symbol (chemistry)
In relation to the chemical elements, a symbol is a code for a chemical element.
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Synthetic element
In chemistry, a synthetic element is a chemical element that does not occur naturally on Earth, and can only be created artificially.
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The Undying Fire (Pratt novel)
The Undying Fire is a science fiction novel by Fletcher Pratt.
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Thermal conductivities of the elements (data page)
No description.
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Thorium
Thorium is a weakly radioactive metallic chemical element with symbol Th and atomic number 90.
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Timeline of chemical element discoveries
The discovery of the 118 chemical elements known to exist today is presented here in chronological order.
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Timeline of chemistry
The timeline of chemistry lists important works, discoveries, ideas, inventions, and experiments that significantly changed humanity's understanding of the modern science known as chemistry, defined as the scientific study of the composition of matter and of its interactions.
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Timeline of the 20th century
This is a timeline of the 20th century.
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Timeline of the San Francisco Bay Area
This is a timeline of the San Francisco Bay Area in California, events in the nine counties that border on the San Francisco Bay, and the bay itself.
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Trace radioisotope
A trace radioisotope is a radioisotope that occurs naturally in trace amounts (i.e. extremely small).
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Transuranium element
The transuranium elements (also known as transuranic elements) are the chemical elements with atomic numbers greater than 92 (the atomic number of uranium).
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Trivial name
In chemistry, a trivial name is a nonsystematic name for a chemical substance.
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Tube Alloys
Tube Alloys was a code name of the clandestine research and development programme, authorised by the United Kingdom, with participation from Canada, to develop nuclear weapons during the Second World War.
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Université de Montréal
The Université de Montréal (UdeM) is a public research university in Montreal, Quebec, Canada.
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University of California, Berkeley
The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public research university in Berkeley, California.
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Uranium
Uranium is a chemical element with symbol U and atomic number 92.
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Uranium dioxide
Uranium dioxide or uranium(IV) oxide (2), also known as urania or uranous oxide, is an oxide of uranium, and is a black, radioactive, crystalline powder that naturally occurs in the mineral uraninite.
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Uranocene
Uranocene, U(C8H8)2, is an organouranium compound composed of a uranium atom sandwiched between two cyclooctatetraenide rings.
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Vapor pressures of the elements (data page)
No description.
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Waste Isolation Pilot Plant
The Waste Isolation Pilot Plant, or WIPP, is the world's third deep geological repository (after closure of Germany's Repository for radioactive waste Morsleben and the Schacht Asse II Salt Mine) licensed to permanently dispose of transuranic radioactive waste for 10,000 years that is left from the research and production of nuclear weapons.
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Yoshio Nishina
was a Japanese physicist.
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Yvette Cauchois
Yvette Cauchois (19 December 1908 – 19 November 1999) was a French physicist known for her contributions to x-ray spectroscopy and x-ray optics, and for pioneering European synchrotron research.
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Zangger Committee
The Zangger Committee, also known as the Nuclear Exporters Committee, sprang from Article III.2 of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) which entered into force on March 5, 1970.
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1940 in science
The year 1940 in science and technology involved some significant events, listed below.
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93 (number)
93 (ninety-three) is the natural number following 92 and preceding 94.
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References
[1] https://en.wikipedia.org/wiki/Neptunium