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Which of the following lanthanoids shows + 4 oxidation state to acquire noble gas configuration?
(At. nos. : La= 57, Ce= 58, Eu= 63 and Yb= 70)

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answer is A.

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Detailed Solution

$\begin{array}{l} C e (Z = 58) ..... [X e] 6 s^{2} 5 d^{1} 4 f^{1} \\ C e^{+ 4} ...... [X e] \end{array}$

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