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Q.
The electronic configuration of an element is $1 s^2 2 s^2 2 p^6 3 s^2 3 d^5 4 s^1$. This represents its
Structure of Atom
Solution:
${ }_{24} Cr =1 s^2 \,2 s^2 \, 2 p^6 \,3 s^2 \,3 p^6 \,3 d^5 \,4 s^1$
This is the ground state electronic configuration for chromium. There is only one electron in the $4 s$ orbital because $d^5$ is a more stable half-filled configuration. Reasons for the stability of the halffilled and fully filled orbitals are symmetry and exchange energy