#### Video

## 2.3 Quantum Numbers (Solution)

#### Lesson Summary

1. Which of the following sets of quantum numbers represents a valence electron in phosphorous?

A. *n* = 4, *l* = 2, m_{l} = -2, m_{s} = –½

B. *n* = 2, *l* = 0, m_{l} = 0, m_{s} = +½

C. *n* = 3, *l* = 3, m_{l} = -2, m_{s} = –½

D. *n* = 3, *l* = 1, m_{l} = -1, m_{s} = +½

2. Please answer each of the following:

a. For *n* = 4, what are the possible values of *l*?

b. For *l* = 2, what are the possible values of m_{l}?

c. If m_{l} is 2, what are the possible values for *l*?

3. Which of the following is a possible set of quantum numbers?

A. *n* = 5, *l* = 3, m_{l} = -2, m_{s} = –½

B. *n* = 3, *l* = 3, m_{l} = 0, m_{s} = +½

C. *n* = 6, *l* = 5, m_{l} = -2, m_{s} = –½

D. *n* = 0, *l* = 0, m_{l} = -1, m_{s} = +½

#### Lesson

2.3 Quantum Numbers (Solution)

#### Instructor

Dr. Christiansen is a chemistry professor at Utah State University and has a PhD in organic chemistry. He's been teaching students chemistry for nearly 12 years.