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The ' f ' orbitals are half and completely filled, respectively in lanthanide ions
(Given: Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb,70;Dy,66)

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${Dy}^{3 +}$ and ${Yb}^{3 +}$

${Tb}^{4 +}$ and ${Yb}^{2 +}$

${Sm}^{2 +}$ and ${Tm}^{3 +}$

${Eu}^{2 +}$ and ${Tm}^{2 +}$

answer is C.

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Detailed Solution

$Tb \to 4 f^{9} 6 s^{2}; {Tb}^{+ 4} \to 4 f^{7}$

$Yb \to 4 f^{14} 6 s^{2}; {Yb}^{+ 2} \to 4 f^{14}$

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