Which of the following does not follow the Au | vedclass

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(B) The Aufbau principle states that electrons fill orbitals in order of increasing energy. Option $A$ represents a valid configuration for $N$ or $O$

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(B) The Aufbau principle states that electrons fill orbitals in order of increasing energy. Option $A$ represents a valid configuration for $N$ or $O$ (depending on total electrons). Option $B$ violates the Aufbau principle because the $2s$ orbital is only half-filled while the $2p$ orbitals are already being filled,which is energetically unfavorable compared to filling the $2s$ orbital completely first. Option $C$ represents the ground state of Nitrogen $(1s^2 2s^2 2p^3)$. Option $D$ represents the ground state of Fluorine $(1s^2 2s^2 2p^5)$. Therefore,option $B$ is the correct answer.

Which of the following does not follow the Aufbau principle?

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