Question

if the spin of one electron in an orbital is clockwise, what is the spin of the other electron in that orbital?
a. both clockwise and counterclockwise
b. counterclockwise
c. clockwise
d. zero

Explanation:

According to the Pauli - exclusion principle, in an orbital, two electrons must have opposite spins. If one is clockwise, the other is counterclockwise.

Answer:

B. counterclockwise