In which of the following lanthanides oxidation state $+ 2$ is most stable ?

C e

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E u

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T b

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D y

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Solution

The correct option is B $E u$
$E u^{2 +}$ has electronic configuration $[X e] 4 f^{7}$ hence stable due to half filled atomic orbitals.

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+ 2

Which of the following oxidation states is the most common among the lanthanides?

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