Question
Fri June 22, 2012 By: Prajitha P
 

Why is 3d subshell having higher energy level than 4s subshell ?

Expert Reply
Sat June 23, 2012
3d subshell having higher energy level than 4s subshell because of n+l rule.Higher the n+l value higher is the energy.For 4s, n+l is 4+0=4 while for 3d, n+l is 3+2=5.So, n+l value is more for 3d and hence it has higher energy level.
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