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Q.

Penultimate shell is represented by

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a

n

b

n-1

c

n-2

d

$2 n^{2}$

answer is B.

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Detailed Solution

In an atom, the outermost shell has principal quantum number,n.

For an atom, n −1 represents penultimate shell.

Ex: For Na, n = 3 is valence shell; n −1=3-1=2is penultimate shell.

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