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Q.

Which of the following trivalent ion has the largest atomic radii in the lanthanide series

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a

$L a$

b

$C e$

c

$P m$

d

$L u$

answer is A.

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Detailed Solution

Lanthanum is the first element of Lanthanide series so size decreases with increase in atomic number so $L a$ has the largest atomic radii

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