SATHEE: The dand fblock elements

The dand fblock elements - Result Question 9

####9. Which of the following lanthanoid ions is diamagnetic?

(At nos. $C e = 58, S m = 62, E u = 63, Y b = 70$ )

[NEET 2013]

(a) $S m^{2 +}$

(b) $E u^{2 +}$

(d) $C e^{2 +}$

Show Answer

Solution:

$[X e] 4 f^{6} 6 s^{2} - 6$ 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 $^{-}$

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

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The dand fblock elements - Result Question 9

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