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d- Block Elements

Which of the ...

Question

Which of the following elements belong to Lanthanide series?

A

Ce

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B

Hg

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C

Th

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D

Mn

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Solution

The correct option is B Ce
Lanthanide series consists of 14 elements from La (Z = 57) to Yb (Z = 70) in which the last electron enters one of the 4f-Orbitals. Ce is a lanthanide with electronic configuration [Xe] 4 $f^{2}$ 5 $d^{0}$ 6 $s^{2}$ .

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