Which of the following is/are wrong statement(s)?

Options

A. The second I.P. is always less than the `1^(st)` I.P. of an atom
B. If the addition of an electron to an ion leads to complete octet, then the process is always exothermic
C. Chlorine has highest electronegativity
D. `1^(st)` I.P. of `N` is higher than `1^(st)` I.P. of `F` because `N` has half filled subshell

Answer

A, B, C, D

Explanation

`IE_(2)gtIE_(1)` (as ENC increases)
`O^(-)+e^(-) to O^(2-)`
Due to FOR between `O^(-)` and `e^(-)` the process is endothermic
`F` has highest electronegativity.
First I.P. of `N` is less than first `I.P.` of `F`.