If an atom has 3 energy levels, how many sublevels should it have?

1

2

3

4

3 (s, p, d)

Explanation:

Principle energy levels number of sublevels number of electrons

1 1s 2n² = 2 (1) ² = 2

2 2s 2n² = 2 (2) ² = 8

2p

3 3s 2n² = 2 (3) ² = 18

3p

3d

when an atom has 3 energy level it has 1 sublevel (s) in 1st energy level 2 sublevels (s ans p) in second energy and three sublevels in third energy level (s, p, d). This atom with n=3 can accommodate 18 electrons in these sublevels.