57 relations: Atomic number, Avogadro constant, Avogadro's law, Beryllium, Big Bang nucleosynthesis, Binding energy, Calcium, Carbon-12, Chemical formula, Chlorine, Dimensionless quantity, Electron, Hydrogen, International System of Units, Iron, Isotope, Isotope geochemistry, Jöns Jacob Berzelius, Jean Stas, John Dalton, Journal of Chemical Education, Karlsruhe Congress, Mass, Mass number, Mass spectrometry, Mean, Molar mass, Molar mass constant, Mole (unit), Molecular mass, Molecule, Mononuclidic element, National Nuclear Data Center, Neutron, Neutron number, Nickel, Niobium, Nuclear binding energy, Nuclear fission, Nuclear fusion, Nuclide, Oxygen, Oxygen-17, Oxygen-18, Proton, Prout's hypothesis, Relative atomic mass, Rounding, Scandium, Standard atomic weight, ..., Stanislao Cannizzaro, Thomas Thomson (chemist), Triple-alpha process, Tritium, Unified atomic mass unit, Vapour density, Zirconium. Expand index (7 more) » « Shrink index
The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of an atom.
In chemistry and physics, the Avogadro constant (named after scientist Amedeo Avogadro) is the number of constituent particles, usually atoms or molecules, that are contained in the amount of substance given by one mole.
Avogadro's law (sometimes referred to as Avogadro's hypothesis or Avogadro's principle) is an experimental gas law relating the volume of a gas to the amount of substance of gas present.
Beryllium is a chemical element with symbol Be and atomic number 4.
In physical cosmology, Big Bang nucleosynthesis (abbreviated BBN, also known as primordial nucleosynthesis, arch(a)eonucleosynthesis, archonucleosynthesis, protonucleosynthesis and pal(a)eonucleosynthesis) refers to the production of nuclei other than those of the lightest isotope of hydrogen (hydrogen-1, 1H, having a single proton as a nucleus) during the early phases of the Universe.
Binding energy (also called separation energy) is the minimum energy required to disassemble a system of particles into separate parts.
Calcium is a chemical element with symbol Ca and atomic number 20.
Carbon-12 is the more abundant of the two stable isotopes of carbon (Carbon-13 being the other), amounting to 98.93% of the element carbon; its abundance is due to the triple-alpha process by which it is created in stars.
A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs.
Chlorine is a chemical element with symbol Cl and atomic number 17.
In dimensional analysis, a dimensionless quantity is a quantity to which no physical dimension is assigned.
The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.
Hydrogen is a chemical element with symbol H and atomic number 1.
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.
Isotopes are variants of a particular chemical element which differ in neutron number.
Isotope geochemistry is an aspect of geology based upon the study of natural variations in the relative abundances of isotopes of various elements.
Baron Jöns Jacob Berzelius (20 August 1779 – 7 August 1848), named by himself and contemporary society as Jacob Berzelius, was a Swedish chemist.
Jean Servais Stas (21 August 1813 – 13 December 1891) was a Belgian analytical chemist that co-discovered the weight of carbon.
John Dalton FRS (6 September 1766 – 27 July 1844) was an English chemist, physicist, and meteorologist.
The Journal of Chemical Education is a monthly peer-reviewed academic journal available in both print and electronic versions.
The Karlsruhe Congress was an international meeting of chemists held in Karlsruhe, Germany from 3 to 5 September 1860.
Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied.
The mass number (symbol A, from the German word Atomgewichte (atomic weight), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It determines the atomic mass of atoms. Because protons and neutrons both are baryons, the mass number A is identical with the baryon number B as of the nucleus as of the whole atom or ion. The mass number is different for each different isotope of a chemical element. This is not the same as the atomic number (Z) which denotes the number of protons in a nucleus, and thus uniquely identifies an element. Hence, the difference between the mass number and the atomic number gives the number of neutrons (N) in a given nucleus:. The mass number is written either after the element name or as a superscript to the left of an element's symbol. For example, the most common isotope of carbon is carbon-12, or, which has 6 protons and 6 neutrons. The full isotope symbol would also have the atomic number (Z) as a subscript to the left of the element symbol directly below the mass number:. This is technically redundant, as each element is defined by its atomic number, so it is often omitted.
Mass spectrometry (MS) is an analytical technique that ionizes chemical species and sorts the ions based on their mass-to-charge ratio.
In mathematics, mean has several different definitions depending on the context.
In chemistry, the molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by the amount of substance.
The molar mass constant, symbol Mu, is a physical constant which relates relative atomic mass and molar mass.
The mole, symbol mol, is the SI unit of amount of substance.
Relative Molecular mass or molecular weight is the mass of a molecule.
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.
A mononuclidic element or monotopic element is one of the 22 chemical elements that is found naturally on Earth essentially as a single nuclide (which may, or may not, be a stable nuclide).
The National Nuclear Data Center is an organization based in the Brookhaven National Laboratory that acts as a repository for data regarding nuclear chemistry, such as nuclear structure, decay, and reaction data, as well as historical information regarding previous experiments and literature.
The neutron number, symbol N, is the number of neutrons in a nuclide.
Nickel is a chemical element with symbol Ni and atomic number 28.
Niobium, formerly known as columbium, is a chemical element with symbol Nb (formerly Cb) and atomic number 41.
Nuclear binding energy is the minimum energy that would be required to disassemble the nucleus of an atom into its component parts.
In nuclear physics and nuclear chemistry, nuclear fission is either a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into smaller parts (lighter nuclei).
In nuclear physics, nuclear fusion is a reaction in which two or more atomic nuclei come close enough to form one or more different atomic nuclei and subatomic particles (neutrons or protons).
A nuclide (from nucleus, also known as nuclear species) is an atomic species characterized by the specific constitution of its nucleus, i.e., by its number of protons Z, its number of neutrons N, and its nuclear energy state.
Oxygen is a chemical element with symbol O and atomic number 8.
Oxygen-17 is a low-abundant, natural, stable isotope of oxygen (0.0373% in seawater; approximately twice as abundant as deuterium).
Oxygen-18 is a natural, stable isotope of oxygen and one of the environmental isotopes.
Prout's hypothesis was an early 19th-century attempt to explain the existence of the various chemical elements through a hypothesis regarding the internal structure of the atom.
Relative atomic mass (symbol: A) or atomic weight is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to one unified atomic mass unit.
Rounding a numerical value means replacing it by another value that is approximately equal but has a shorter, simpler, or more explicit representation; for example, replacing $ with $, or the fraction 312/937 with 1/3, or the expression with.
Scandium is a chemical element with symbol Sc and atomic number 21.
The standard atomic weight (Ar, standard, a relative atomic mass) is the atomic weight (Ar) of a chemical element, as appearing and met in the earthly environment.
Stanislao Cannizzaro FRS (13 July 1826 – 10 May 1910) was an Italian chemist.
Thomas Thomson (12 April 1773 – 2 July 1852) was a British chemist and mineralogist whose writings contributed to the early spread of Dalton's atomic theory.
The triple-alpha process is a set of nuclear fusion reactions by which three helium-4 nuclei (alpha particles) are transformed into carbon.
Tritium (or; symbol or, also known as hydrogen-3) is a radioactive isotope of hydrogen.
The unified atomic mass unit or dalton (symbol: u, or Da) is a standard unit of mass that quantifies mass on an atomic or molecular scale (atomic mass).
Vapour density is the density of a vapour in relation to that of hydrogen.
Zirconium is a chemical element with symbol Zr and atomic number 40.