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

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1. D

2. a – l=0,1,2,3; b – ml=-2,-1,0,+1,+2; c – l=2,3

3. A