SATHEE: D-And F-Block Elements Ques 510

D-And F-Block Elements Ques 510

Question: Which of the following lanthanoid ions is diamagnetic- (At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

Options:

A) $S m^{2 +}$

B) $E u^{2 +}$

C) $Y b^{2 +}$

D) $C e^{2 +}$

Show Answer

Answer:

Correct Answer: C

Solution:

$S m^{2 +} (Z = 62)$ $[X e] 4 f^{6} 6 s^{2} - 6$ unpaired $e^{-} E u^{2 +} (Z = 63)$

$[X e] 4 f^{7} 6 s^{2} - 7$ unpaired $e^{-} Y b^{2 +} (Z = 70)$

$[X e] 4 f^{14} 6 s^{2} - 0$ unpaired $e^{-} C e^{2 +} (Z = 58)$

$[X e] 4 f^{1} 5 d^{1} 6 s^{2} - 2$ unpaired $e^{-}$

Only $Y b^{2 +}$ is diamagnetic.

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