Answer
a. 5p
b. not allowed
c. 3d
d. 4f
d. 7s
Work Step by Step
a. n = 5 (principle), l = 1 (p subshell)
b. Not allowed as l cannot be greater than n - 1
c. n = 3 (principle), l = 2 (d subshell)
d. n = 4 (principle), l = 3 (f subshell)
e. n = 7 (principle), l = 0 (s subshell)