出典:Wiktionary
polyvalence (countable かつ uncountable, 複数形 polyvalences)
出典:Wikipedia
出典:『Wikipedia』 (2011/04/19 08:31 UTC 版)
In chemistry, polyvalence or multivalence refers to species that are not restricted to a distinct number of valence bonds. (Species with only one valence are univalent (monovalent)). For example, the Cs+ cation is a univalent or monovalent cation, whereas the Ca2+ cation is a divalent or polyvalent or multivalent cation and the Fe3+ cation is a trivalent or polyvalent or multivalent cation. As a result, examples of polyvalent cations include the Ca2+ cation and the Fe3+ cation.