Question

arrange the elements of the 2nd and the 3rd period in the increasing order of their atomic size

Answer 1

Second Period
F, O,N,C,B,Be,Ne,Li
Third period
Cl, S, P, Si, Al, Mg, Ar, Na

Answer 2

Hii, mate here is your answer:-

In second period the elements were arranged in increasing order like this

F,O,N,C,B,Be,Li,Me

Or, we can also write like this

Li > Be > B > C > N > O > F > Me

In third period the elements were arranged in increasing order like this

Cl,S,P,Si,Al,Mg,Na,Ar

Or, we can also write like this

Na > Mg > Al > Si > P > S > Cl > Ar

I hope this helps you.......

Please mark it as brainleast answer....

Ok mate, bye bye