Question

In the third excited state the number of unpaired electrons in chlorine atom is:

• A. 5
• B. 7
• C. 3
• D. 1

Answer 1

The correct option is B 7

The general electronic configuration of chlorine is $\left[Ne\right]3s^{2}3p^5$

When electrons are excited in chlorine, the electrons enter into 3d subshell then electronic configuration of chlorine is given as:

$\left[Ne\right]3s^{1}3p^{3}3d^3$

Thus the number of unpaired electrons will be 7.