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

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

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

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

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

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Solution

The correct option is B $Y^{3 +} < L u^{3 +} < E u^{3 +} < L a^{3 +}$
Y belongs to $5^{t h}$ period & La belongs to $6^{t h}$ period. Ionic radii increases from $Y^{3 +} t o L a^{3 +}$ down the group. Due to lanthanoid contraction, ionic radii follows the order
$L u^{3 +} < E u^{3 +} < L a^{3 +}$

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Similar questions

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

Y^{3 +}, L a^{3 +}, E u^{3 +}

L u^{3 +}

C e^{3 +}, L a^{3 +}, P m^{3 +}

Y b^{3 +}

C e, L a, P m

Y b

+ 3

Arrange $C e^{3 +}, L a^{3 +}, P m^{3 +}$ and $Y b^{3 +}$ in increasing order of their ionic radii.

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