For H-atom, the energy required for the removal of electron from various sub-shells is given as under:

The order of the energies would be :

Options

A. a. `E_1 gt E_2 gt E_3`
B. b. `E_3 gt E_2 gt E_1`
C. c. `E_1 lt E_2 lt E_3`
D. d. `E_1 lt E_3 lt E_2`

Answer

C

Explanation

for H 3s = 3p = 3d in energy