Question

In how many elements does the outer most electron has quantum numbers $n=4,l=0,m=\pm 1$?

• A. $2$
• B. $14$
• C. $0$
• D. $12$

Answer 1

Answer: (C)

$0$

Azimuthal quantum number$\left(l\right)$ corresponds to $(n-1)$, where $n$ is principal quantum number. For $n=4$ corresponding value of $l$ is 3 hence $l=0$ is not possible, the answer is 0.