Question
Two electrons occupying the same orbital are distinguished by
A.
Magnetic quantum number
B.
Azimuthal quantum number
C.
Spin quantum number
D.
Principal quantum number
Answer :
Spin quantum number
Solution :
Two electrons occupying the same orbital has
equal spin but the directions of their spin are
opposite. Hence, spin quantum number, $$s,$$ ( represented $$ + \frac{1}{2}\,and - \frac{1}{2}$$ ) distinguishes them.