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The group in which all the element does not have same number of electrons in their valence shell is :

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zero

second

first

seventh

answer is A.

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Detailed Solution

The group in which all the element does not have same number of electrons in their valence shell is zero.

The valence shells of the elements in the zeroth group do not contain the same number of electrons. Inert elements are those in the zero group. The next eight elements in the group each have two electrons, except for helium.

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