Question

9cw1
how many energy sublevels are in the second principal energy level?
3
4
1
2

Explanation:

The principal energy level is denoted by \(n\). The number of sublevels in a principal energy level is equal to \(n\). For the second principal energy level (\(n = 2\)), the possible sublevels are \(s\) (angular momentum quantum number \(l=0\)) and \(p\) (\(l = 1\)). So there are 2 sublevels.

Answer:

2