How many different sub levels are there in the third level?

In the third energy level of an atom, which corresponds to the principal quantum number ( n = 3 ), there are three sublevels: ( s ), ( p ), and ( d ). Specifically, these sublevels are designated as 3s, 3p, and 3d. Each of these sublevels can hold a different number of electrons, with 3s holding a maximum of 2, 3p holding a maximum of 6, and 3d holding a maximum of 10. Thus, there are three distinct sublevels in the third energy level.