What is the electronic configuration of Cu? | vedclass

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

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

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(D) The atomic number of copper $(Cu)$ is $29$. According to the Aufbau principle,the expected configuration is $[Ar] \, 3d^9 \, 4s^2$. However,a fully filled $d$-subshell is more stable due to symmetry and exchange energy. Therefore,one electron from the $4s$ orbital jumps to the $3d$ orbital to make it $3d^{10}$. The correct electronic configuration is $[Ar] \, 3d^{10} \, 4s^1$.

What is the electronic configuration of $Cu$?

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