What is the observed electronic configuration | vedclass

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(B) $1$. The atomic number of $Cu$ is $29$.$2$. According to the Aufbau principle, the expected configuration is $[Ar] 3d^9 4s^2$.$3$. However, a comp

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$[Ar] 3d^{10} 4s^1$

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(B) $1$. The atomic number of $Cu$ is $29$.$2$. According to the Aufbau principle, the expected configuration is $[Ar] 3d^9 4s^2$.$3$. However, a completely filled $d$-subshell $(d^{10})$ provides extra stability due to symmetry and exchange energy.$4$. Therefore, one electron from the $4s$ orbital shifts to the $3d$ orbital, resulting in the observed configuration: $[Ar] 3d^{10} 4s^1$.

What is the observed electronic configuration of $Cu$?

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