1. Tardigrade
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  3. Chemistry
  4. If the nitrogen atom had electronic configuration 1s7, it 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, because it violates

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Q. If the nitrogen atom had electronic configuration $1s^7$, it would have energy lower than that of the normal ground state configuration $1s^2 \, 2s^2 \, 2p^3 $ , because the electrons would be closer to the nucleus, yet $1s^7$ is not observed, because it violates

IIT JEEIIT JEE 2002Structure of Atom

Solution:

$1s^7$ violate Pauli exclusion principle, according to which an orbital cannot have more than two electrons.