For CuCO3, it is made up of Cu2+ and CO32- ions. Copper will appear to have ON of +2 (from its charge). Recall that O as oxide have an ON of -2, calculating for C:
x + 3(-2) = -2
x - 6 = -2
x = 6 - 2
x = +4
Determine the oxidation number (oxidation state) of EACH element in the following six compounds.
f. (NH4)2 CrO4
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