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

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

Answer

  1. Improper shielding effect.

Explanation:

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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