The aufbau principle implies that a new electron will enter an orbital for which :

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(n + I) value is maximum

(n + I) value is minimum

n has a lower value

I has a lower value

answer is D.

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Detailed Solution

The Aufbau principle states that the electrons are filled into an atomic orbital in the increasing order of orbital energy level, according to the Aufbau principle, the available atomic orbitals with the lowest energy levels are occupied before those with higher energy levels.

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