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Q.

Among the following, atomic radius is highest for

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a

Eu

b

Ce

c

La

d

Lu

answer is A.

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Detailed Solution

In lanthanide series starts from Lanthanum (La) with atomic no. Z =57 and it ends with Lutetium (Lu) with Z =71. In a period from left to right atomic radius decreases gradually. Therefore, in given all elements ‘La’ has the highest atomic radius.

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Among the following, atomic radius is highest for