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Periodic Table and Periodicity question

2022 · Q96
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Periodic Table and Periodicity question

2022 · Q96

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1

Gadolinium has a low value of third ionisation enthalpy because of

  1. A
    small size
  2. B
    high exchange enthalpy
  3. C
    high electronegativity
  4. D
    high basic character
View written solutionFree

Correct answer: B

Electronic configuration of Gadolinium

Gd :- [Xe] 4f7 5d1 6s2

In case of 3rd ionisation enthalpy electron will be removed from 5d and resultant configuration will be [Xe]4f7 that is stable electronic configuration as it will have high exchange energy, hence less energy will be required to remove 3rd electron.

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