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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Which of the following statements is/are wrong?
  • A
    van der Waals' radius of iodine is more than its covalent radius
  • ✓
    All isoelectronic ions belong to same period of the periodic table
  • C
    $I.E._1$ of $N$ is higher than that of $O$ while $I .E._2$ of $O$ is higher than  that of $N$
  • D
    The electron affinity $N$ is almost zero while that of $P$ is $74.3 \,kJ\, mol^{-1}$
✓

Answer

Correct option: B.
All isoelectronic ions belong to same period of the periodic table
b
$(b)$ In the isoelectronic species, all isoelectronic anions belong to the same  period and cations to the next period.

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