or a given principal level n = 4, the energy of its subshells is in the order

or a given principal level n = 4, the energy of its subshells is in the order

A

s < p < d < f

B

s > p > d > f

C

s < p < f < d

D

f < p < d < s

Answer:

The correct option is A. s < p < d < f

Note