20. An element X is cation with valancy 2 and another element Y is anion with valancy 1. The compound formed by these two elements will be:
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XY2
Explanation:
cations are positively charged ions .Hence valency of X is 2+ . anions are negatively charged.hence valency of Y is 1- .By criss crossing the valencies of X and Y we get the formula of the compound i.e. XY2
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