Question

Which is not a formula for a diatomic molecule? N2 O3 He

Answer 1

He because nitrogen and ozone is a molecule but helium is atom

Answer 2

Ans: Thus, O3 and He are not the formulas for diatomic. Only N2 is a diatomic

A monatomic system consists of only a single element

A diatomic system consists of two elements

A polyatomic systems consists of more that two elements

1) N2: nitrogen molecule is composed of 2 N atoms. Hence it is a diatomic

2) O3: ozone is composed on 3 O atoms. Hence it is a triatomic (polyatomic)

3) He: Helium is  simply a monatomic