Question
How many electrons in an atom may have the following quantum numbers?
$\text{n}=4,\text{m}_{\text{s}}=-\frac{1}{2}$

Answer

The total number of electrons in n is given by 2n2
n = 4, Number of electrons = 2 × 4= 32
Half of 32 electrons will have spin quantum number $\text{m}_{\text{s}}=-\frac{1}{2}$ i.e. 16 electrons

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