Question

Which element among the lanthanoids has the smallest atomic radius?
a) Cerium
b) Lutetium
c) Europium
d) Gadolinium

Answer 1

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b) Lutetium

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Answer 2

Answer: The correct answer is Option b.

Explanation:

All these elements are known as lanthanoids. The size of the elements decreases as we move from left to right in a period. This happens due to lanthanoid contraction. This term means a significant and steady decrease in the size of atoms or ions of lanthanoids, with increasing atomic number.

Hence, lanthanum has the largest atomic radius and lutetium has the smallest atomic radius. This contraction arises due to imperfect shielding of one electron by the other in the same sub-shell.

Hence, the correct answer is Option b.