2. Give an example of
(a) diatomic element
(b) polyatomic element​

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(a) Diatomic Element :-

Diatomic elements are pure elements that form molecules consisting of two atoms bonded together. There are seven diatomic elements: hydrogen, nitrogen, oxygen, fluorine, chlorine, iodine, bromine.

(b) Polyatomic Element​ :-

Any molecule that contains more than 2 atoms is polyatomic. So that would be ozone (O3), etc. Anything that consists of two or more atoms is called molecular.

Explanation:

(a) Diatomic Element :-

For example, oxygen can exist as the triatomic molecule, ozone.

(b) Polyatomic Element​ :-

For example oxygen (O2), nitrogen (N2), ozone (O3), carbon dioxide (CO2), methane (CH4), benzene (C6H6), and way bigger like rotaxane or proteins or polymers.