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Question
Q466) If the nitrogen atom had electron configuration 1s7, it will would have energy lower than that of the normal ground state configuration 1s2 2s2 2p3 because the electrons would be closer to the nucleus. Yet 1s7 is not observed. It violets ... [ IIT 2002]




SOLUTION

According to Pauli exclusion principle an orbital cannot accommodate more than two electrons and those to with opposite spin
Answer: (c)