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Three elements X, Y and Z belong to 17^(...

Three elements X, Y and Z belong to `17^(th)` group but `2^(nd),3^(rd)and4^(th)` period respectively. Number of valence electrons in Y is 7. Find the number of valence electrons in X and Z.

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Verified by Experts

It will be 7 in X as well as in Z.
The reason being that number of electrons in the outermost shell in the elements in same group is same.
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OSWAAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-TOPIC:2-SHORT ANSWER TYPE QUESTIONS-I
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  14. Given below are atomic radii of same elements of second period. {:("...

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