Which of the following species has the highest electron affinity?

Options

A. `F^(-)`
B. `O^(-)`
C. `O`
D. `Na^(+)`

Answer

A

Explanation

In general , electron gain enthalpy becomes more and more negative from left to right in a period. This is due to decreases in size and increase in nuclea charge as the atomic number increases in a period. Both these factors favour the addition of an extra electrons due to higher forces of attraction by the nucleus for the incoming electron.