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Question

The subshell 4s has  the smaller energy than the subshell 3d.But the subshell configuration of Cr is 1s2 2s2p3s3p6 3d4s1.why did 3d came 1st and 4s after it ???


Solution

symmetry leads to stability.
 Thus, the electronic configuration in which all the orbitals of the same sub-shell are either completely filled or exactly half filled are more stable because of symmetrical distribution of electrons. 

Cr has 1s2 2s2p3s3p6 3d4s1
Configuration​​​​​ in order to attain symmetry.

 

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