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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.
Explanation
Electrons in one orbital differ only in spin.
Detailed Solution
Two electrons in the same orbital have the same n, l and $m_l$, but differ in the fourth quantum number, the spin quantum number: $m_s = +\frac{1}{2}$ and $m_s = -\frac{1}{2}$.