When there are two electrons in the same orbital, they have:

A. Same spin

B. Opposite spin

C. Same or opposite spin

D. No spin

Answer: Option B

Solution(By Examveda Team)

When there are two electrons in the same orbital, they have opposite spins. The Pauli exclusion principle states that there can only be a maximum of two electrons for every one orientation, and the two electrons must be opposite in spin direction; meaning one electron has ms=+21 and the other electron has ms=−21.