Which of the following is correct?
1. The principal quantum number, n, describes the shape of an atomic orbital.
2. No more than two electrons in an atom can have the same principal quantum number (n).
3. The magnetic quantum number, m, is related to the orientation in space of an orbital within a given subshell.
Select one:
O a. 1 only
O b. 2 only
O c. 3 only
O d. 1, 2, and 3
e. Not enough information
