Why does 4s have a lower energy level than the 3d?
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- Thread Starter
- 07-10-2013 22:37
- 08-10-2013 00:51
So for the transition metals, the 3d orbital is lower in energy than 4s, but the greater electron repulsion associated with sticking electrons in the smaller 3d orbitals outweighs this and the 4s is filled first.