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Question

Is the electrovalency of metal and non-metal equal in a compound? Give few examples for ionic compounds in which metal and non-metal possess different electrovalencies.

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Solution

Electrovalency of metal and non-metal means tendency to form ionic bonds and it is not same in an electrovalent compound. This is because of the fact that the number of electrons lost by a metal need not be equal to the number of electrons gained by a non-metal in a particular electrovalent compound. For example, in case of magnesium oxide, each magnesium loses two electrons and oxygen gains 2 electrons. Therefore the electrovalency of both metal and non-metal is 2. But, in case of calcium chloride, electrovalency of calcium is 2 and that of chlorine is 1.

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