Correct option is (4) He
The electronic configuration of the given element is:
Ne : [He]2s22p6
He\(^\oplus\) : 1s1
Na+: 2p6
He : 1s2
Although Ne, He and He\(^\oplus\) all have fully filled stable configuration but the electron is to be removed from a 1s shell in case of He. 1s shell being closest to the nucleus makes quite tough to remove an electron from it. Thus, the element having the highest I.P. value is Helium.
