Which quantum number distinguishes the electron present in the same orbital of an atom?
A. Azimuthal quantum number
B. Magnetic quantum number
C. Principal quantum number
D. Spin quantum number
Answer is option D, spin quantum number.
The two electrons occupying the same orbital can never have the same spin. The spin quantum number can be either +1/2 or -1/2 and distinguishes the two electrons present in the same orbital.
The two electrons occupying the same orbital can never have the same spin. The spin quantum number can be either +1/2 or -1/2 and distinguishes the two electrons present in the same orbital.