who amongst halogens or noble gas have highest ionisation potential???plz give single ans

The ionisation potential increases across a period from left to right.

Therefore,among noble gases,helium posess the highest ionisation.

and among halogens,flourine posess the highest ionisation potential.

but is the nueclear charge doesnt make change on IE

but in some books it is florine

is the book is wrong

FlOurine will have grater I.E. in halogen family due to its very smaller size than others. 

Of Course! noble gases have highest ionisation enrgy in compare of halogens.

approve!

Approved

noble gases have the highest ionisation potential