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Among the following which one indicates the period number of an element?

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Valency shell principal quantum number

No. of valency electrons

Atomic number

No. of subshell

answer is A.

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Detailed Solution

For the element, valency shell principal quantum number indicates the period number.

Ex: For Boron, electron configuration is $1 s^{2} 2 s^{2} 2 p^{1}$ .

Principal quantum number of valence shell, $n = 2$ .

Hence, boron belongs to 2^nd period.

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