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Q.

What is the trend of electronegativity down a group?

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a

increases down a group

b

remains same throughout

c

decreases down a group

d

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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