Having or Exhibiting Two Different Valences

This page is the CodyCross answer for the clue below from Mexico, Group 1374, Puzzle 2 (Carnival Season).

Question is: Having or Exhibiting Two Different Valences

and the answer is: BIVALENT

Word Meaning:

BIVALENT — (inorganic chemistry, organic chemistry, physical chemistry) Having a valence of 2; having two ligands

Definitions from Wiktionary.