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118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
List of chemical elements. Element Origin of name [1] [2] Group Period Block Standard atomic weight A r °(E) [a] Density [b] [c] Melting point [d] Boiling point [e ...
List of elements by atomic properties; List of elements by stability of isotopes; A. Abundance of elements in Earth's crust; D. Discovery of chemical elements; M.
This glossary of chemistry terms is a list of terms and definitions relevant to chemistry, including chemical laws, diagrams and formulae, laboratory tools, glassware, and equipment. Chemistry is a physical science concerned with the composition, structure, and properties of matter , as well as the changes it undergoes during chemical reactions ...
Transition elements * Elements in groups 3 to 11 or 3 to 12 (the latter making up the d-block) Pnictogens: The elements of group 15: N, P, As, Sb, Bi † Chalcogens: The elements of group 16: O, S, Se, Te, Po † Halogens: The elements of group 17: F, Cl, Br, I, At † Noble gases: The elements of group 18: He, Ne, Ar, Kr, Xe, Rn †
41 of the 118 known elements have names associated with, or specifically named for, places around the world or among astronomical objects. 32 of these have names tied to the places on Earth, and the other nine are named after to Solar System objects: helium for the Sun; tellurium for the Earth; selenium for the Moon; mercury (indirectly), uranium, neptunium and plutonium after their respective ...
A chemical element is a chemical substance whose atoms all have the same number of protons.The number of protons is called the atomic number of that element. For example, oxygen has an atomic number of 8, meaning each oxygen atom has 8 protons in its nucleus.
13497-96-6 AlCl 3: aluminium trichloride: 7446-70-0 AlCl 4 Cs: aluminium caesium tetrachloride: 17992-03-9 AlCl 4 K: potassium tetrachloroaluminate: 13821-13-1 AlCl 4 Na: sodium tetrachloroaluminate: 7784-16-9 AlCl 4 Rb: rubidium tetrachloroaluminate: 17992-02-8 AlCl 6 K 3: potassium hexachloroaluminate: 13782-08-6 AlCl 6 Na 3: sodium ...