Why do the names of some ionic compounds include the charge of the metal ion while others do not?

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This is because the metal ion has variable valency, so the oxidation state of the metal has to be included to show this.

Simple ionic compounds that dont have variable valency will not include this oxidation state.
answered May 27, 2012 by awesome ~Expert~ (1,479 points)
selected May 27, 2012 by Gummmys