The correct order of ionic radii of Y ^ 3+ , La ^ 3+ , Eu ^ 3+ and Lu ^ 3+ is - (Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71.)

NEET 2003 Chemistry question

The correct order of ionic radii of , , and is -

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

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

Across the lanthanides the ionic radius of decreases steadily with increasing atomic number (lanthanide contraction), because the added electrons shield the increasing nuclear charge poorly. So (57) is the largest, (63) is smaller, and (71, the

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Question ID VK-089217