Why the 4s orbitals fill prior to 3d orbitals?

Asked by Topperlearning User | 26th Jun, 2014, 09:46: AM

Expert Answer:

The 3d orbitals of the transition elements project to the periphery of an atom more than the 4s orbitals. Thus it has higher energy than 4s orbitals. This is the reason 4s orbitals fills prior to 3d orbitals.

Answered by  | 26th Jun, 2014, 11:46: AM