Which electronic configuration does not follo | vedclass

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(C) The $(n + l)$ rule states that orbitals are filled in increasing order of $(n + l)$ values.For $4s$,$(n + l) = 4 + 0 = 4$.For $3d$,$(n + l) = 3 +

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$1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^5, 4s^1$

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(C) The $(n + l)$ rule states that orbitals are filled in increasing order of $(n + l)$ values.For $4s$,$(n + l) = 4 + 0 = 4$.For $3d$,$(n + l) = 3 + 2 = 5$.According to the rule,$4s$ should be filled before $3d$.In option $(C)$,the configuration $3d^5, 4s^1$ represents Chromium $(Z=24)$.While this configuration is stable due to the half-filled $d$-subshell,it technically violates the Aufbau principle (which is based on the $(n+l)$ rule) because an electron is placed in $3d$ before $4s$ is completely filled with $2$ electrons.

Which electronic configuration does not follow the $(n + l)$ rule?

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