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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
The ionization energies from $\ce{Ga}$ to $\ce{Tl}$ do not decrease due to :
  • A
    Shielding effect
  • ✓
    Improper shielding effect.
  • C
    Increase in the atomic size.
  • D
    Decrease in the nuclear charge.
✓

Answer

Correct option: B.
Improper shielding effect.
Due to poor shielding effect of $d$ and $f$ orbitals, which balances the effect of increase in nuclear charge down the group, resulting in unevenness in the trend.

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