how will the compound "Mghl2" and "CaO" be formed their element
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Mg has valency +2 and Cl has valency -1 to make bond with Mg we have to take 2 atom of Cl. Then both together formed MgCl2 compound
Ca has valency +2 and O has valency -2 and it is sufficient to fulfill the valency of Ca. Then both of them come together and formed CaO compound
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