How many of the following species have lower ${\mathbf{I}\mathrm{E}}_1$ value compared to ${\mathrm{F}}^{-}$?

${\mathrm{Cl}}^{-},{\mathrm{Br}}^{-},{\mathrm{O}}^{-},{\mathrm{I}}^{-}$

Fluorine, chlorine, bromine, and iodine have first ionization energies of 1681, 1251, 1140, and 1008 eV, respectively.

The six elements in Group 17 of the periodic table make up the halogen elements. In the periodic table, group 17 is represented by the elements' fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).

Consequently, ${\mathrm{Br}}^{\ominus },{\mathrm{O}}^{\ominus },{\mathrm{I}}^{\ominus }$ has a lower initial ionization energy than F-