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Which of the following lanthanoid ions is diamagnetic? (At. nos. Ce = 58, Sm = 62, Yb = 70)
A
$Yb^{2+}$
B
$Ce^{2+}$
C
$Sm^{2+}$
D
$Eu^{2+}$
Detailed Solution
A diamagnetic ion has no unpaired electrons.
$Yb^{2+}$ (Z = 70): $[Xe]4f^{14}5d^06s^0$ — all electrons paired, so it is diamagnetic.
$Yb^{2+}$ (Z = 70): $[Xe]4f^{14}5d^06s^0$ — all electrons paired, so it is diamagnetic.