Question

The atomicity of a noble gas is:

• A. 2
• B. 1
• C. 0
• D. 6

Answer 1

The correct option is B 1

Atomicity of a gas is the number of an element present in one molecule of that element.
The gases can be:-
monoatomic: Helium($He$)
diatomic: Hydrogen($H_2$)
triatomic: Ozone($O_3$)
Noble gases are inert compounds. Under normal conditions they exist as monoatomic gases. Hence, the atomicity of noble gases is 1.