The reason behind different energies between the various subshells of the same shell is that there exists a mutual repulsion among the electrons in multi-electron atoms. The stability of multi-electron atom is due to the bigger magnitude of attractive force between nucleus and electrons as compared to the forces of repulsion between electrons of the inner shell and outer shell.This is known as the shielding of the outer shell electrons from the nucleus by the inner shell electrons
(a) as per n+l rule
The energy of an electron of 2py orbital is
(a) Greater than that of $2p_x$ orbital
(b) Less than that of $2p_x$ orbital
(c) Equal to that of 2s orbital
(d) Same as that of $2p_z$ orbital
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