Question

Electronic configuration of only one $\text{P}$ block element is exceptional. One molecule of that element consists of how many atoms of it?

• A. One
• B. Two
• C. Three
• D. Four

Answer 1

The correct option is A One

P-block element show general electronic configuration of $n{s}^{2}n{p}^{1-6}$.

But, $He$ is the only p-block element which shows the exceptional electronic configuration of $1s^2$.

Since it is the noble gas, it is monoatomic.

Thus, one molecule of $He$ contains only one atom.

Hence, the correct option is $\text{A}$