The correct order of ionic radii for Y 3 + , E u 3 + , L a 3 + , L u 3 + Options: A . &nbspLa3+ B . &nbspY3+ C . &nbspLu3+ D . &nbspLu3+

The correct order of ionic radii for Y3+, Eu3+, La3+, Lu3+

Question

The correct order of ionic radii for

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

Options:

A . La3+

B . Y3+

C . Lu3+

D . Lu3+

Answer: Option B
:
B
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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