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This is an index of lists of molecules (i.e. by year, number of atoms, etc.). Millions of molecules have existed in the universe since before the formation of Earth. Three of them, carbon dioxide , water and oxygen were necessary for the growth of life.
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). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
Nitrogen is a chemical element; it has symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table, often called the pnictogens. It is a common element in the universe, estimated at seventh in total abundance in the Milky Way and the Solar System.
Symbol Name Atomic number Origin of symbol Ac: Actinium: 89: From Greek aktinos. Name restricted at one time to 227 Ac, an isotope of actinium. This named isotope later became the official name for element 89. AcA: Actinium A: 84: From actinium and A. Placeholder name given at one time to 215 Po, an isotope of polonium identified in the decay ...
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z). Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
18812-51-6 C 7 H 17 O 3 P: diisopropyl methylphosphonate: 1445-75-6 C 7 H 18 NO 3 P: ethyl isopropyl dimethylphosphoramidate: 99520-56-6 C 7 H 18 N 2: butyltrimethylhydrazine: 52598-10-4 C 7 H 18 OSi: methoxytriethylsilane: 2117-34-2 C 7 H 18 O 3 Si: prosil 178: 18395-30-7 C 7 H 18 O 3 Si: trimethoxybutylsilane: 1067-57-8 C 7 H 18 Sn ...
An atom (or ion) whose oxidation number increases in a redox reaction is said to be oxidized (and is called a reducing agent). It is accomplished by loss of one or more electrons. The atom whose oxidation number decreases gains (receives) one or more electrons and is said to be reduced. This relation can be remembered by the following mnemonics.
List of alchemical substances; List of chemical elements; List of minerals – List of minerals with Wikipedia articles; List of named alloys; List of straight-chain alkanes; Polyatomic ion – Ion containing two or more atoms; Exotic molecule – a compound containing one or more exotic atoms