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An ionic compound forms when a metal bonds with a non-metallic element. Metals usually form the cation and non-metal anions. Chromium has an oxidation number of +3 in the compound and charge on hydroxide ion is -1.
Cation here is
Anion is the hydroxide ion
So the formula of the compound will be: . The compound has one chromium atom and two hydroxide ions.
Therefore, there will be one Chromium atom per each chromium hydroxide compound.