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)

JEE Advanced Chemistry question

The correct order of ionic radii of , , and is (Atomic number of Y = 39, La = 57, Eu = 63, Lu = 71)

(A)
(B)
(C)
(D)Correct

Answer: (D)

Solution

Within the lanthanide series, ionic radius steadily decreases with increasing atomic number (lanthanide contraction), so (Z = 57, start of series) is the largest, followed by (Z = 63), with (Z = 71, end of series) the smallest lanthanide. Yttrium, though a group 3 d-block element (not a

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Question ID VK-159780