Question

What is the maximum number of electrons in an atom in which the last electron, filled, has the following quantum numbers?

• A. $n=3,l=1$
• B. $n=3,l=2$
• C. $n=3,l=2$ and $m=-1$
• D. $n=3,l=1$ and $m=-1$
• E. $n=3,l=2,m=0$ and $s=-\frac{1}{2}$

Answer 1

The correct option is B $n=3,l=2$

$n=3$ means third subshell and $l=2$ means $3d$ subshell which have 10 electrons

And $n=3,l=1$ means $3p$ subshell which contains 6 electrons.

If value of $m$ or $m_s$ is given it shows orbitals and spin which limits the number of electrons.

So option $B$ is correct.