Question

Every principal energy level contains:

an s sublevel

a p sublevel

a d sublevel

s, p and d sublevels

Answer 1

s p d and f. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d10 4f.. 

Answer 2

An s sublevel

Step-by-step explanation:

As can be seen in the picture not all energy levels have all the types of sublevels (s, p, d, f).

Only the higher energy levels have all of them, but as it shows all start with an S sublevel