Which of the following electronic configuration of lanthanides is related to the easy formation of +2 ion ?

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$[Xe] 4 f^{7} 5 d^{1} 6 s^{2}$

$[Xe] 4 f^{1} 5 d^{1} 6 s^{2}$

$[Xe] 4 f^{14} 5 d^{1} 6 s^{2}$

$[Xe] 4 f^{7} 6 s^{2}$

answer is C.

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Detailed Solution

Europium (atomic number 63) has the electronic configuration [Xe] 4f⁷ 6s², it loses two electrons from 6s energy level and attains the highly stable, half-filled 4f⁷ configuration and hence it readily forms Eu²⁺ion.

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