Question

The atomicity of neon gas is:
(A) Two
(B) One
(C) Four
(D) Three

Answer 1

Hint: We know that atomicity is the total number of atoms in a molecule. Different gases have different atomicity or combining capacity. To check this we have to see the number of valence electrons.

Step by step solution:
We know that neon is a p-block, $2^{nd}$ period and $18^{th}$ group element. And also we know that the atomic number of neon is 10 and has 10 electrons and 10 protons. It is found in gaseous state.
The configuration of neon is:\[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}\]. So, from the configuration we can see that it has 8 electrons in its outer shell which means its octet is complete. It doesn’t gain or lose electrons and it is stable in nature. So, it does not make bonds with any other atom.
It is a monatomic gas and its atomicity is one. Neon atoms are the molecules of the latent, colorless, and scentless gas neon. In normal conditions all noble gas exists as monatomic. Neon is a non-toxic gas.
So, from the above explanation we can say that the correct answer is option “B”.

Note: Neon is utilized as filling gas in red lights, in lasers, in plasma shows, in cryogenic applications, and so forth. All gases don’t have one atomicity, only the noble gases have atomicity one.