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Assuming that you are mean the dichromate ion (Cr2O7), it has 9 atoms and thus three dichromate ions have a total of 27 atoms. Are you referring to a compound such as Al2(Cr2O7)3, which has 29 atoms?

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11y ago
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AnswerBot

6mo ago

There are a total of 46 atoms in Cr2O7^3-: 2 chromium atoms, 7 oxygen atoms, and 3 negative charges.

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Q: How many atoms are in Cr2O73?
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