Home › JEE Main › Chemistry › d- and f-Block Elements › Eu²⁺ is more stable than other Ln²⁺ because:
Eu²⁺ is more stable than other Ln²⁺ because:
AEu(II) achieves stable half-filled 4f⁷ configuration
BAlways
CRandom
DLight
Answer & Solution
Correct answer: A. Eu(II) achieves stable half-filled 4f⁷ configuration
Eu²⁺: 4f⁷ (half-filled, stable by Hund's rule). Yb²⁺: 4f¹⁴ (full, also stable). Both are reasonably stable in solution (unlike most Ln²⁺ which are strong reducers).
Related questions
Which of the following coordination compounds shows OPTICAL ISOMERISM?The HEXACYANIDOFERRATE(II) ion $[\mathrm{Fe(CN)_6}]^{4-}$ contains iron in oxidation state$[\mathrm{Ni(CO)_4}]$ is tetrahedral and diamagnetic. The oxidation state of nickel in thiCoordination compounds of transition metals are often COLOURED. CFT explains this colour aWhich of the following best states the CHELATE EFFECT?Cis-trans isomerism is observed in$[\mathrm{Fe(CN)_6}]^{4-}$ has $\mathrm{CN^-}$ ligands, which are STRONG-FIELD ligands. ThIn CRYSTAL FIELD THEORY (CFT) for an OCTAHEDRAL complex, the five degenerate d-orbitals of