Which of the following electronic configurati | vedclass

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(D) According to the Aufbau principle,electrons fill orbitals in order of increasing energy. In option $D$,the configuration $1s^2 2s^2 2p^2 3s^1$ is

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

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(D) According to the Aufbau principle,electrons fill orbitals in order of increasing energy. In option $D$,the configuration $1s^2 2s^2 2p^2 3s^1$ is incorrect because the $2p$ subshell can hold up to $6$ electrons. Before an electron can occupy the $3s$ orbital,the $2p$ subshell must be filled to its capacity. Therefore,the correct configuration for an atom with $7$ electrons would be $1s^2 2s^2 2p^3$.

Which of the following electronic configurations is not possible?

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