Question

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

Explanation:

In atomic structure, the principal energy level \( n \) determines the number of sublevels. The formula for the number of sublevels in a principal energy level is \( n \) (where \( n = 1,2,3,\cdots \)). For the second principal energy level (\( n = 2 \)), the sublevels are \( s \) and \( p \).

Answer:

2