Question

A neutral atom of an element has 2K, 8L and 5M electrons. What is the number of electrons having n=2?

• A. 6
• B. 8
• C. 10
• D. 4

Answer 1

The correct option is B 8

The above diagram shows the electronic configuration of the given neutral atom.

The neutral atom is phosphorous.

It's electronic configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$.

From the configuration, it can be seen that for n=2, it has $8$ electrons.

Hence, option $\left(B\right)$ is correct.