Question

Write the electronic configuration of the element in which the element holds orbitals having the same energies even for different azimuthal quantum number?

Answer 1

Kr (Z=36)e.c is 1s² ,2s² ,2p⁶ ,3s² ,3p⁶ ,4s² ,3d¹⁰,4p⁶ . 

2p⁶ orbital has same energy as3s² , &3d¹⁰ orbital has same energy as 4p⁶ etc.