Which of the following elements has atomicity 2? (I) helium (II) nitrogen (III) aluminium (Iv) phosphorus

Dear Student,

Please find below the solution for your asked query:

1) Elements whose molecule made up of single atom is known as monoatomic element. For example :- He, Ne, Ar, Cu, Fe, Al, etc.
 
2) Diatomic element :- Element whose molecules are composed of two same atoms, for example :- H2 , N2 , F2 , O2 , Cl​2, etc.
 
3) Tri-atomic element : Element whose molecules are composed of same three atoms . For example : O3
 
4) Polyatomic element :- Elements whose molecules are composed of two or more same elements :- P4 , S8, etc. 


Therefore, option (2) is correct i.e. Nitrogen has atomicity = 2.

Hope this helps!

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