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QUESTION

# In the polyatomic ion, CrO4 -2, what is the charge on the chromium atom?

The oxidation state of Cr in chromate ion, CrO_4^(2-), is VI^+.

As far as anyone knows, the charge in chromate is localized on the oxygen (i.e (O=)_2Cr(-O^-)_2). Chromic acid, H_2CrO_4 (or (O=)_2Cr(-OH)_2), is the precursor; this is a potent oxidant. In each case, the metal oxidation state (VI^+) is clear. Note that in this formal representation, the charge on chromium is neutral. The negative charge is borne by the 2 singly bound oxygen atoms.