What is the trend of electronegativity down a group?

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increases down a group

decreases down a group

remains same throughout

decreases first then increases

answer is B.

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Detailed Solution

The tendency of an atom in a molecule to attract the shared pair of electrons toward itself is called its electronegativity.
There is an increase in atomic number down a group so the nuclear charge also increases but due to the addition of extra shells, the atomic size increases.
The effect of an increase in the atomic size overcomes the effect of an increase in the nuclear charge hence electronegativity decreases down a group.

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