Question

4.) how many electrons can be held in the n=1 or s orbital? (1 point)
five
zero
three
two
5.) which combination of principal energy level and sublevel cannot exist? (1 po
2d
3p
4f
1s

Explanation:

1. The n=1 principal energy level only has an s sublevel. An s orbital can hold a maximum of 2 electrons (per Pauli exclusion principle).
2. For a principal energy level n, sublevels exist from l=0 to l=n-1 (s=0, p=1, d=2, f=3). For n=2, l can only be 0 or 1 (s or p), so 2d (l=2) cannot exist.

Answer:

1. Two
2. 2d