How many electrons have an azimuthal quantum number (l) with the value +1 in a fluorine atom?

a. zero
b. six
c. two
d. five
e. four

5

Explanation:

F:1s²2s²2p₋₁²2p₀²2p₊₁¹

QN's for each of nine Fluorine e⁻'s => values in 'bold' are the orbital (or, azimuthal) QN's with values = +1.

           n    l     m    mₓ

1s¹        1     0    0   +1/2

1s²       1     0    0   -1/2

2s¹       1     0   0   +1/2

2s²       1     0    0   -1/2

2p₋₁¹     1     +1  -1   +1/2

2p₀¹      1     +1   0   +1/2

2p₊₁¹     1     +1  +1   +1/2

2p₋₁²     1     +1    -1   -1/2

2p₀²      1     +1   0   -1/2

2p₊₁     (empty orbital)