Question

two elements X and Y belong to group 1 and 2 respectively in the same period of the periodic table . compare these elements with respect to
1. number of valence electrons in their outermost orbit
2 .their valencies
3 .metallic character
4 .their atomic size
5 .formula of their chlorides

Answer 1

1. On moving along the period,the valence electron increases. So element X has 1 valence electron while element Y has 2 valence electrons.
2. X has 1 valency and Y has 2 valency.
3. The metallic character decreases. The element Y is the most metallic element than element X.
4. The atomic size decreases. The element Y is bigger than element X.
5. The formula of chloride of X is XCl and Y is YCl2.

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