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Introduction

Three element...

Question

Three elements $X, Y$ and Z belong to 17th group but to 2nd, 3rd and 4th period respectively. A number of the valence electron in Y is 7.Find the number of the valence electron in X and Z.

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Solution

The number of valence electron is 7 in X and Z. It is because the number of electrons in outermost shell in the element is same for a group.

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