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Take into account that oxygen has a negative 2 charge (O-2) and there are 3 of them; therefore, to form this compound Cobalt must have a positive 3 charge (Co3+) because there are 2 of them.

The name of this compound is Cobalt (III) oxide or Cobaltic oxide.

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12y ago
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Q: Binary ionic compound name for Co2O3?
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