when calcium reacts with oxygen to form an ionic compound each metal atom loses ? electron(s) and each nonmetal atom gains ? electron(s). There must be ? calcium atom(s) for every ? oxygen atom(s) in the reaction

when calcium reacts with oxygen to form an ionic compound each metal atom loses ? electron(s) and each nonmetal atom gains ? electron(s). There must be ? calcium atom(s) for every ? oxygen atom(s) in the reaction

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