Question

How many electrons in an atom have the following quantum numbers?
$n=4$, $m_s=-1/2$

• A. $32$
• B. $18$
• C. $8$
• D. $16$

Answer 1

Answer: (D)

Total no. of electrons $=2n^2$
if $n=4$, no. of electrons $=32$
Total number of electrons with $m_s=\frac{-1}{2}$ will be $16$.