Section: Chemistry: Section I

2) How many electrons can exist in all the atomic orbitals that correspond to the principal quantum number 4?

1. 2
2. 8
3. 18
4. 32
5. 40

The four energy level contains electrons in the s, p, d, and f orbitals. All you need to do is take the sum of the number of electrons and all four orbitals (s:2, p:6, d:10, f:14) to reach the correct answer of 32.