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Which of the following is the result of f-orbital contraction effect?

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Similarity in the size of Al and Ga

Similarity in the properties of Li and Mg

High ionization energy of Tl as compared to In

Decrease in atomic size of '3d' series elements

answer is C.

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Detailed Solution

Due to the f-orbital contraction effect ionization energy of Tl is grater than the In.

The 4f electrons' ineffective shielding produces the Lanthanide Contraction. The shielding effect is the phenomena where the outer-shell electrons are protected from nuclear charge by the inner-shell electrons.

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