If ' \( n \) ' and ' \( l \) ' are principal and azimuthal quantum ...

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If ' \( n \) ' and ' \( l \) ' are principal and azimuthal quantum numbers respectively, the expression for calculating the total number of electrons in any shell is
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(A) \( \sum_{l=0}^{l=n} 2(2 l+1) \)
(B) \( \sum_{l=1}^{l=(\mathrm{n}-1)} 2(2 l+1) \)
(C) \( \sum_{l=0}^{l=(\mathrm{n}+1)} 2(2 l+1) \)
(D) \( \sum_{l=0}^{l=(\mathrm{n}-1)} 2(2 l+1) \)
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