JEE Advanced 2016 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Advanced 2016

The increasing order of atomic radii of the following Group 13 elements is

(A)Al < Ga < In < Tl
(B)Ga < Al < In < TlCorrect
(C)Al < In < Ga < Tl
(D)Al < Ga < Tl < In

Answer: (B)

Solution

Atomic radius generally increases down a group, but gallium is an exception: the ten electrons added before Ga shield the nuclear charge poorly, so the effective nuclear charge on the outer electrons is high and Ga (135 pm) is

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-026504