Question

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

Explanation:

The principal energy level is denoted by \( n \). For a given \( n \), the number of sub - levels is equal to \( n \). When \( n = 2 \), the sub - levels are \( s \) ( \( l=0 \)) and \( p \) ( \( l = 1 \)).

Answer:

2