Select the correct answer from each of the following questions: If the nitrogen atom had electr...

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Select the correct answer from each of the following questions:

If the nitrogen atom had electronic configuration \( 1 s^{7} \), it would have energy lower than that of the normal ground state configuration \( 1 s^{2} 2 s^{2} 2 p^{3} \), because the electrons would be closer to the nucleus. Yet \( 1 s^{7} \) is not observed. It violates
(A) Heisenberg's uncertainty principle
(B) Hund's rule
(C) Pauli's exclusion principle
(D) Bohr postulate of stationary orbits.
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