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Periodic Table and Periodicity question

2018 · Q101
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Periodic Table and Periodicity question

2018 · Q101

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1
The correct order of atomic radii in group 13 elements is
  1. A
    B < Al < In < Ga < Tl
  2. B
    B < Al < Ga < In < Tl
  3. C
    B < Ga < Al < Tl < In
  4. D
    B < Ga < Al < In < Tl
View written solutionFree

Correct answer: D

Ga is slightly smaller than Al due poor shielding of d e– so Zeff increasing.

So, Atomic size : B < Ga < Al < In < Tl

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