Lanthanide contraction is due to

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ineffective shielding of nuclear charge by 3 d electrons

ineffective shielding amongst 3d electrons

ineffective shielding amongst 4 f electrons

decrease in the electronic repulsion.

answer is C.

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Detailed Solution

The Lanthanide Contraction is the result of a poor shielding effect of the 4f electrons. 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 .

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