English edit

 
A molecule of methanol. Suppose one of the hydrogens (white) is deuterium. Is the deuterium attached to the carbon (black) or oxygen (red)?

Etymology edit

iso- +‎ topomer

Noun edit

 
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isotopomer (plural isotopomers)

  1. (physical chemistry) An isomer of a compound differing only in the position of an isotope

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