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It can also be used with highly specific meanings in specialised contexts. In the description of protein structure, in particular in the Protein Data Bank file format, a heteroatom record (HETATM) describes an atom as belonging to a small molecule cofactor rather than being part of a biopolymer chain.
Cyclo[6]carbon is an allotrope of carbon with molecular formula C 6. The molecule is a ring of six carbon atoms, connected by alternating double bonds . [ 1 ] It is, therefore, a member of the cyclo[ n ]carbon family.
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 ...
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 ...
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 ...
The common atom that connects the two (or sometimes three) rings is called the spiro atom. [2]: SP-0 In carbocyclic spiro compounds like spiro[5.5]undecane, the spiro-atom is a quaternary carbon , and as the -ane ending implies, these are the types of molecules to which the name spirane was first applied (though it is now used general of all ...
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.
Each distinct atomic number therefore corresponds to a class of atom: these classes are called the chemical elements. [5] The chemical elements are what the periodic table classifies and organizes. Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on.