Diamagnetic Lanthanoid ions are:

Options

A ${Nd}^{3 +}$ and ${Eu}^{3 +}$
B ${La}^{3 +}$ and ${Ce}^{4 +}$
C ${Nd}^{3 +}$ and ${Ce}^{4 +}$
D ${Lu}^{3 +}$ and ${Eu}^{3 +}$

Correct answer

B. ${La}^{3 +}$ and ${Ce}^{4 +}$

Step-by-step solution

Lanthanide ion with no unpaired electron is diamagnetic in nature.

Lanthanoid is also called lanthanide, which can be defined as any of the series of $15$ consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers $57 - 71$ ). With the elements scandium and yttrium, they make up the rare-earth metals. Lanthanides are also radioactive in nature.

$Ce: [ Xe ] 4{f}^{1}5{d}^{1}6{s}^{2}; {Ce}^{4 +}$ diamagnetic

$La: [ Xe ] 4{f}^{0}5{d}^{1}6{s}^{2}; {La}^{3 +}$ diamagnetic

Hence, the answer is option B.

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Given below are two statements: Statement I: The number of pairs among [Ti^ 4+ , V^ 2+ ]… JEE Main 2026 Given below are two statements for catalytic properties of transition metals. Statement… JEE Main 2026 The correct order of first (Δ_i H_1) and second (Δ_i H_2) ionisation enthalpy values of… JEE Main 2026 The correct statements among the following are. A. Basic vanadium oxide is used in the… JEE Main 2026 Given below are two statements : Statement I: Presence of large number of unpaired… JEE Main 2026 A paper dipped in a dil. H_2SO_4 solution of ' X ' upon treatment with SO_2 gas turns… JEE Main 2026 Which of the following is NOT a physical or chemical characteristics of interstitial… JEE Main 2026 Pairs of elements with the same number of electrons in their respective 4f orbital are… JEE Main 2026 Full d and f Block Elements list All JEE Main PYQs