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Question

The correct order of ionic radii of $$Y^{3+}, La^{3+}, Eu^{3+}$$ and $$Lu^{3+}$$ is:
(Atomic number of Y=39, La=57, Eu=63, Lu=71)


A
Lu3+<Eu3+<La3+<Y3+
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B
La3+<Eu3+<Lu3+<Y3+
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C
Y3+<La3+<Eu3+<Lu3+
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D
Y3+<Lu3+<Eu3+<La3+
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Solution

The correct option is B $$Y^{3+} < Lu^{3+} < Eu^{3+} < La^{3+}$$
Due to lanthanide contraction size of lanthanides ions decreases from  $$La^{3+}$$ to $$Lu^{3+}$$.
so order is $$Y^{3+} < Lu^{3+} < Eu^{3+} <  La^{3+}$$

Hence, the correct option is $$D$$.

Chemistry

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