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Q.

It has been observed that size of Indium (In) • Thallium (Tl). This can be attributed to :

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a

actinoid contraction

b

scandide contraction

c

both (a) and (b)

d

lanthanoid contraction

answer is B.

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Detailed Solution

In and Tl have nearly similar atomic radii due to poor screening effect shown by f-electrons in the anti penultimate shell of Tl.

The shielding effect is described as the phenomenon by which the inner-shell electrons shield the outer-shell electrons so they are not effected by nuclear charge.

Hence, the correct option is B.

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