Which of the following electronic configurati | vedclass

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Question

(D) According to the Aufbau principle,electrons fill orbitals in order of increasing energy. Specifically,the $2p$ subshell must be completely filled

Vedclass · Accepted Answer

$1s^2 2s^2 2p^2 3s^1$

Vedclass · Answer

(D) According to the Aufbau principle,electrons fill orbitals in order of increasing energy. Specifically,the $2p$ subshell must be completely filled before electrons enter the $3s$ subshell. In the configuration $1s^2 2s^2 2p^2 3s^1$,the $2p$ subshell is only partially filled $(2p^2)$ while an electron has already entered the $3s$ orbital,which violates the Aufbau principle. Therefore,this configuration is not possible.

Which of the following electronic configurations is not possible?

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