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4) a) property is conduction of electricity
b) property is insulation
7) a) valency of X is +2 and Y is +3
b) they can be placed in 2nd and 13 the group respective
b) property is insulation
7) a) valency of X is +2 and Y is +3
b) they can be placed in 2nd and 13 the group respective
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