51 relations: Atom, Ball-and-stick model, CAS Registry Number, Chemical Abstracts Service, Chemical bond, Chemical element, Chemical formula, Chemical polarity, Chemical reaction, Chemical structure, Chemical substance, Chemistry, Coordinate covalent bond, Coordination complex, Covalent bond, Crust (geology), Crystal structure, Diatomic molecule, Dipole, Electron, Electronegativity, Electrostatics, Glossary of chemical formulas, Hydrogen, Hydrogen atom, Hydrogen bond, Intermetallic, Intermolecular force, Ion, Ionic bonding, Ionic compound, Isotope, IUPAC nomenclature of chemistry, List of compounds, London dispersion force, Mantle (geology), Metallic bonding, Molecular entity, Molecule, Non-stoichiometric compound, Octet rule, Oxygen, Palladium hydride, Periodic table, Properties of water, Salt (chemistry), Silicate minerals, Stoichiometry, Subscript and superscript, Valence electron, ..., Water. Expand index (1 more) » « Shrink index
An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
In chemistry, the ball-and-stick model is a molecular model of a chemical substance which is to display both the three-dimensional position of the atoms and the bonds between them.
A CAS Registry Number, also referred to as CASRN or CAS Number, is a unique numerical identifier assigned by the Chemical Abstracts Service (CAS) to every chemical substance described in the open scientific literature (currently including all substances described from 1957 through the present, plus some substances from the early or mid 1900s), including organic and inorganic compounds, minerals, isotopes, alloys and nonstructurable materials (UVCBs, of unknown, variable composition, or biological origin).
Chemical Abstracts Service (CAS) is a division of the American Chemical Society.
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds.
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).
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.
In chemistry, polarity is a separation of electric charge leading to a molecule or its chemical groups having an electric dipole or multipole moment.
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.
A chemical structure determination includes a chemist's specifying the molecular geometry and, when feasible and necessary, the electronic structure of the target molecule or other solid.
A chemical substance, also known as a pure substance, is a form of matter that consists of molecules of the same composition and structure.
Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms: their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds.
A coordinate covalent bond, also known as a dative bond or coordinate bond is a kind of 2-center, 2-electron covalent bond in which the two electrons derive from the same atom.
In chemistry, a coordination complex consists of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligands or complexing agents.
A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms.
In geology, the crust is the outermost solid shell of a rocky planet, dwarf planet, or natural satellite.
In crystallography, crystal structure is a description of the ordered arrangement of atoms, ions or molecules in a crystalline material.
Diatomic molecules are molecules composed of only two atoms, of the same or different chemical elements.
In electromagnetism, there are two kinds of dipoles.
The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.
Electronegativity, symbol ''χ'', is a chemical property that describes the tendency of an atom to attract a shared pair of electrons (or electron density) towards itself.
Electrostatics is a branch of physics that studies electric charges at rest.
This is a list of common chemical compounds with chemical formulas and CAS numbers, indexed by formula.
Hydrogen is a chemical element with symbol H and atomic number 1.
A hydrogen atom is an atom of the chemical element hydrogen.
A hydrogen bond is a partially electrostatic attraction between a hydrogen (H) which is bound to a more electronegative atom such as nitrogen (N), oxygen (O), or fluorine (F), and another adjacent atom bearing a lone pair of electrons.
An intermetallic (also called an intermetallic compound, intermetallic alloy, ordered intermetallic alloy, and a long-range-ordered alloy) is a solid-state compound exhibiting metallic bonding, defined stoichiometry and ordered crystal structure.
Intermolecular forces (IMF) are the forces which mediate interaction between molecules, including forces of attraction or repulsion which act between molecules and other types of neighboring particles, e.g., atoms or ions.
An ion is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons).
Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds.
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding.
Isotopes are variants of a particular chemical element which differ in neutron number.
The International Union of Pure and Applied Chemistry (IUPAC) has published four sets of rules to standardize chemical nomenclature.
Compounds are organized into the following lists.
London dispersion forces (LDF, also known as dispersion forces, London forces, instantaneous dipole–induced dipole forces, or loosely van der Waals forces) are a type of force acting between atoms and molecules.
The mantle is a layer inside a terrestrial planet and some other rocky planetary bodies.
Metallic bonding is a type of chemical bonding that arises from the electrostatic attractive force between conduction electrons (in the form of an electron cloud of delocalized electrons) and positively charged metal ions.
A molecular entity is "any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer, etc., identifiable as a separately distinguishable entity".
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.
Non-stoichiometric compounds are chemical compounds, almost always solid inorganic compounds, having elemental composition whose proportions cannot be represented by integers; most often, in such materials, some small percentage of atoms are missing or too many atoms are packed into an otherwise perfect lattice work.
The octet rule is a chemical rule of thumb that reflects observation that atoms of main-group elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electron configuration as a noble gas.
Oxygen is a chemical element with symbol O and atomic number 8.
Palladium hydride is metallic palladium that contains a substantial quantity of hydrogen within its crystal lattice.
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.
Water is a polar inorganic compound that is at room temperature a tasteless and odorless liquid, which is nearly colorless apart from an inherent hint of blue. It is by far the most studied chemical compound and is described as the "universal solvent" and the "solvent of life". It is the most abundant substance on Earth and the only common substance to exist as a solid, liquid, and gas on Earth's surface. It is also the third most abundant molecule in the universe. Water molecules form hydrogen bonds with each other and are strongly polar. This polarity allows it to separate ions in salts and strongly bond to other polar substances such as alcohols and acids, thus dissolving them. Its hydrogen bonding causes its many unique properties, such as having a solid form less dense than its liquid form, a relatively high boiling point of 100 °C for its molar mass, and a high heat capacity. Water is amphoteric, meaning that it is both an acid and a base—it produces + and - ions by self-ionization.
In chemistry, a salt is an ionic compound that can be formed by the neutralization reaction of an acid and a base.
Silicate minerals are rock-forming minerals with predominantly silicate anions.
Stoichiometry is the calculation of reactants and products in chemical reactions.
A subscript or superscript is a character (number, letter or symbol) that is (respectively) set slightly below or above the normal line of type.
In chemistry, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.
Water is a transparent, tasteless, odorless, and nearly colorless chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms.