Medium
If $n$ and $l$ are principal and azimuthal quantum numbers respectively,then the expression for calculating the total number of electrons in any energy level is:
- A$\sum\limits_{l = 0}^{l = n} {2(2l + 1)} $
- B$\sum\limits_{l = 1}^{l = n - 1} {2(2l + 1)} $
- C$\sum\limits_{l = 0}^{l = n + 1} {2(2l + 1)} $
- D$\sum\limits_{l = 0}^{l = n - 1} {2(2l + 1)} $
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