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Answered 2011-06-13 03:36:35

Two Chromium Atoms, and 3 Oxygen Atoms. (Cr2O3)

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The empirical formula of calcium oxide is CaO, the same as the formula unit.

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CrO since the subscripts cancel out but the question really should not be asking what is the formula for chromium oxide, it should be asking what is the formula for Chromium(II)Oxide

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CrO2this is the incorrect formula. For Chromium II oxide the formula is actually CrO without the 2. The reason for this is simple. the II after chromium indicates that it has a charge of +2, and the oxygen, we know is in group 16, has a charge of -2. The formula CrO2 is actually the formula for chromium IV oxide>

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from my work and looking around i think it is TeO2

Cr2O3 is the chemical formula for chromium (III) oxide

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