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4. d and f- block elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
The pair of lanthanides in which both elements have high third-ionization energy is:
  • A
    $Eu , Gd$
  • ✓
    $Eu , Yb$
  • C
    $Lu , Yb$
  • D
    $Dy, Gd$
✓

Answer

Correct option: B.
$Eu , Yb$
b
$\left.Eu ^{+2}:[ Xe ] 4 f ^7\right\}$ High IE due to half

$\left.Yb ^{+2}:[ Xe ] 4 f ^{14}\right\}$ filled \& fully filled configurations

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