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JEE Main levelOne or more correct optionsDifficulty 2 of 3df143

Which of the following statements about trivalent lanthanide ions are correct?

A $La X^{3 +}$ ( $4 f^{0}$ ) is diamagnetic.
B $Lu X^{3 +}$ ( $4 f^{14}$ ) is diamagnetic.
C $Yb X^{3 +}$ ( $4 f^{13}$ ) is diamagnetic.
D $Gd X^{3 +}$ ( $4 f^{7}$ ) has seven unpaired electrons.

Answer: A, B, D

4 f^{14}

,

4 f^{7}

and

4 f^{0}

give 0, 7 and 0 unpaired electrons, so the first three statements are right.

Yb X^{3 +}

is

4 f^{13}

with one unpaired electron and is paramagnetic.

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