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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 ...
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
Nonterminal symbols are those symbols that can be replaced. They may also be called simply syntactic variables. A formal grammar includes a start symbol, a designated member of the set of nonterminals from which all the strings in the language may be derived by successive applications of the production rules.
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.
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 ...
C 6 ClF 5 O 2 S: pentafluorobenzenesulfonyl chloride: 832-53-1 C 6 CrO 6: chromium hexacarbonyl: 13007-92-6 C 6 Cr 23: chromium carbide: 12105-81-6 C 6 F 14 NO: pentafluoronitrosobenzene: 1423-13-8 C 6 F 10: decafluorocyclohexene: 355-75-9 C 6 F 10 O 2: octafluoroadipoyl fluoride: 37881-62-2 C 6 F 10 O 3: pentafluoropropionic anhydride: 356-42 ...
A 3D model of ethyne (), the simplest alkyneIn organic chemistry, an alkyne is an unsaturated hydrocarbon containing at least one carbon—carbon triple bond. [1] The simplest acyclic alkynes with only one triple bond and no other functional groups form a homologous series with the general chemical formula C n H 2n−2.
The practice also continues with tritium compounds. When the name of the solvent is given, a lowercase d is sometimes used. For example, d 6-benzene or C 6 D 6 can be used instead of C 6 [2 H 6]. [14] The symbols for isotopes of elements other than hydrogen and radon are no longer used in the scientific community.