For the energy levels in an atom , which of the following statement is //are correct ?

Options

A. There are seven principle electron energy levels
B. The second principal energy level can have four sub-energy levels and contains a maximum of eight electrons.
C. The `M` energy level can have maximum of `32` electrons
D. The `4 s` sub-energy level is at a higher energy than the `3 d` sub-energy level.

Answer

B

Explanation

(b) The second principal shell contains four orbitals `viz 2 s, 2 p_x, 2p_y` and `2 p_z`.