The electronic configuration for the following neutral atoms are given for use in question.
(a) `1s^(2) 2s^(2) 2p^(6) 3s^(2)`
(b) `1s^(2) 2s^(2) 2p^(6) 3s^1 `
(c ) ` 1s^(2) 2s^(2) 2p^(4)`
(d) `1s^(2) 2s^(2) 2p^(5)`
(e) `1s^(2) 2s^(2) 2p^(6) `
Which of the electronic configuration given above would you expect for the noble gas?

Explanation

(i) Lowest ionisation enthalpy = D
Highest ionisation enthalpy = A
(ii) Order of increasing negative electron gain enthalpy is :
`A lt C lt D lt B lt E`