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Three elements X, Y and Z belong to 17th...

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

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All the elements present in a group have same number of valence electrons whatever may the periods to which they belong. Since element Y has 7 valence electrons, the elements X and Z have also 7 valence electrons.
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