According to the Pauli exclusion principle, when can two electrons occupy the same orbital?

a) only if there is no place else to put them
b) only if they have the same spin
c) only if they opposite spins
d) only if they're alike in all of their properties

Respuesta :

C.

For electrons to occupy the same orbital, every other orbital in the sub shell must have at least one electron and the paired electrons must have opposite spins.