Going from fluorine, chlorine, bromine to iodine, the electronegativity :

increases

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first decreases then increases

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decreases

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changes randomly

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Solution

The correct option is C decreases
As the size increase in a group, effective nuclear charge of the atom decreases. Hence, ability to attract electrons decreases.

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why is fluorine more electronegative than chlorine,bromine and iodine?

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