First slide

Atomic and physical properties

Question

Which of the following trend followed by electronegativity down the group?

Easy

A

Decreases
B

Increases
C

Decreases from B to A1 and then increases marginally
D

Increases from B to Al and then decreases marginally

Solution

Down the group-l3, electronegativity decreases from B to Al and then increases marginally. This is because the size increases ,yet the effective nuclear charge increases because of the poor shielding of d - and f- electrons.as a result, force of attraction of the nucleus for the electrons increases and hence the electronegativity increases from Al to Tl.

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