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

(Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)

(a) Y3+ < La3+ < Eu3+ < Lu3+

(b) Y3+ < Lu3+ <  Eu3+ <  La3+

(c) Lu3+<  Eu3+ <  La3+< Y3+

(d)  La3+ <  Eu3+ < Lu3+ < Y3+

1 Answer

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Best answer

Correct option (b) Y3+ < Lu3+ <  Eu3+ <  La3+

Explanation :

On going from La3+ to Lu3+, the ionic radius shrinks from 1.15 Å to 0.93 Å (lanthanide contraction). The radius of La3+ is also larger than that ol Y3+ ion which lies immediately above it in periodic table.

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