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

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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