Why electonic configuration of Cs is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 In this after 3p6 their should be the turn of a s-subgroup but there isn't apply.....
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First of all the given electronic configuration is of atomic number 30 that means zinc
As according to n+l rule 3d becomes less energetic subshell as compared to 4s electron prefer to enter 3d orbit
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