An element X from group 2 reacts with element Y from group 17 to form a compound.(a) What is the nature and formulae of the compound?(b) State whether this compound conducts electricity or not?(c) What is the valency of X and Y?(d) How many valence electrons are there in X and Y?

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Solution

1. Formula of the compound is XY₂
It is ionic in nature as it id formed when X donates its two electrons to two atoms of Y.
2. The compound being ionic conducts electricity.

3. Valency of X is 2 and that of Y is 1.
4. Valence electrons of X is 2 and of Y is 7

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