In a chemical compound, would you expect an oxide ion to be joined with one atom of calcium or
one atom of potassium? Why?

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Answer:

  • An oxide ion, an oxygen ion with a -2 charge, should be joined with 1 atom of calcium in a chemical combination. Ca+2 O-2 would create CaO, just as it would in the formation of a compound, as we can see from the chemical formula.

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