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(B) The given electronic configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^1$. This configuration corresponds to the element Chromium $(Cr)$,which ha

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Ground state

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(B) The given electronic configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^1$. This configuration corresponds to the element Chromium $(Cr)$,which has an atomic number of $24$. According to the Aufbau principle,the expected configuration is $3d^4 4s^2$,but due to the extra stability of half-filled $d$-orbitals,one electron from the $4s$ orbital shifts to the $3d$ orbital. Therefore,$3d^5 4s^1$ is the stable ground state configuration of $Cr$.

The electronic configuration of an element is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^1$. This represents its

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