JEE Main 2025 — Structure Of Atom Question with Solution

Correct statements for an element with atomic number 9 are:

A. There can be 5 electrons for which $m_s=+\frac{1}{2}$ and 4 electrons for which $m_s=-\frac{1}{2}$.

B. There is only one electron in $p_z$ orbital.

C. The last electron goes to orbital with $n=2$ and $l=1$.

D. The sum of angular nodes of all the atomic orbitals is 1.

Choose the correct answer from the options given below: