The correct order of ionic radii of $Y^{3 +}, L a^{3 +}, E u^{3 +}$ and $L u^{3 +}$ is

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$L a^{3 +} < E u^{3 +} < L u^{3 +} < Y^{3 +}$

$Y^{3 +} < L a^{3 +} < E u^{3 +} < L u^{3 +}$

$Y^{3 +} < L u^{3 +} < E u^{3 +} < L a^{3 +}$

$L u^{3 +} < E u^{3 +} < L a^{3 +} < Y^{3 +}$

answer is C.

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Detailed Solution

In lanthanide series there is a regular decrease in the atomic as well as ionic radii of trivalent ions $(M^{3 +})$ as the atomic number increases. Although the atomic radii do show some irregularities but ionic radii decreases from La (103 pm) to Lu (86pm).

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