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The chemical formula for magnesium oxide is MgO. Magnesium has valency +2 and oxygen has -2. So, magnesium donates two electrons and oxygen gains two electrons to form ionic bond.

The chemical formula for strontium oxide is SrO. Strontium has valency +2 and oxygen has -2. So, strontium donates two electrons and oxygen gains two electrons to form ionic bond.

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Q: What are the formulas for magnesium oxide and strontium oxide?
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