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