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The group number of element in periodic table indicates:

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Oxidation number

Valency with respect to hydrogen

The number of electrons in the outermost shell

The atomicity

answer is C.

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Detailed Solution

The number of electrons in the outermost shell will decide group number

The number of electrons in the outermost shell will decide group number ${ns}^{1}$

No. of valence electrons = group number = one

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