In chemistry, molecular entity is any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer etc., identifiable as a separately distinguishable entity. [1] In this context, both a single unattached human molecule as well as the bonded unit of two human molecules, such as in a married relationship, defined as a dihumanide molecule, can each be referred to as a molecular entity.

See also
Chemical species
Chemical substance

1. Molecular entity – IUPAC Gold Book.

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