different between stereogenic vs stereogenicity

English

stereo- +? -genic

stereogenic (not comparable)

(chemistry, physics) describing a grouping of atoms in a molecule
1. consisting of a central atom and four distinguishable ligands such that the interchange of any two leads to a stereoisomer
2. consisting of four non-coplanar atoms such that rotation about the central bond leads to a stereoisomer
3. consisting of a double bond with substituents which give rise to cis-trans isomerism

stereogenic +? -ity

stereogenicity (countable and uncountable, plural stereogenicities)

(chemistry) The condition of being stereogenic, or of having a stereogenic grouping of atoms.

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