Question

Halogen with highest ionization energy is $F$. State whether the statement is true or false

Answer 1

Halogen with highest ionization energy is $F$. The ionization energies (in kJ/mol) of $F,Cl,Br$ and $I$ are $1681,1255,1140$ and $1008$ respectively.

On moving down the group, the ionization energies decrease. Fluorine is smallest among halogens. It has no tendency to lose it's valence electrons. Hence, it has highest ionization energy.