(say, ¹²C and ¹³C), there would be three distinct structural isotopomers, since 1-¹³C-1,1-dideuteroethene would be different from 1-¹³C-2,2-dideuteroethene. And, in both cases, the 1,2-dideutero structural isotopomer would occur as two stereoisotopomers, cis and trans.

Structural equivalence and symmetry

Structural equivalence

Two molecules (including polyatomic ions) A and B have the same structure if each atom of A can be paired with an atom of B of the same element,

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