Which of the following has the highest ionization energy?

F

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C l

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B r

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I

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Solution

The correct option is A $F$
On moving down the group, ionization energy of halogens decreases due to the increase in atomic size.

Element Ionization Enthalpy
(in kJ/mol)

$F$ 1680

$C l$ 1256

$B r$ 1142

$I$ 1108

Hence, option (a) is the correct answer.

Suggest Corrections

Element	Ionization Enthalpy (in kJ/mol)
$F$	1680
$C l$	1256
$B r$	1142
$I$	1108