Question

Electronic configuration of only one 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

The electronic configuration of an only p-block element is exceptional. One molecule of that element consists of only one atom of it.

As the exception is found in only He, as helium has the electronic configuration to be $1s^2$. But other member of the same group has $n{s}^{2}n{p}^6$ configuration.

So, this is an exceptional case where He does not resemble its group in its configuration.
And as He is a noble gas element so it is monoatomic gas.