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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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$E u^{2 +}$ and $T m^{2 +}$

$S m^{2 +}$ and $T m^{3 +}$

$T b^{4 +}$ and $Y b^{2 +}$

$D y^{3 +}$ and $Y b^{3 +}$

answer is C.

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Detailed Solution

$T b^{4 +} - [X e] 4 f^{7} 5 s^{0} 6 s^{0}$

$Y b^{+ 2} - [X e] 4 f^{14} 5 d^{0} 6 s^{0}$

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