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Which principle is not followed in writi...

Which principle is not followed in writing the electronic configuration of `1s^(2) 2s^(1) 2p^(4)` ? Give reasons.

Text Solution

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1) Principle : i) Aufbau principle is not followed in writing the electronic configuration of `1s^(2) 2s^(1) 2p^(4)` .
2) Reasons : i) According to Aufbau principle electron enters into orbital of lowest energy,
ii) Between 2s and 2p , 2s has least energy . So 2s must be filled before the electron has to enter 2p .
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