Which of the following is the correct electro | vedclass

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

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

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

Which of the following is the correct electronic configuration of $Cu$ (atomic number $29$)?

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