Question

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

• A. equal
• B. opposite
• C. no spins
• D. all the above

Answer 1

Answer: (B)

opposite

For two electrons in the same orbital, their spin quantum number needs to be different i.e both the electrons must be of opposite spins since $s$ can take only two possible values, +1/2 or -1/2.