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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
Choose the correct statement
  • ✓
    In thorium, the last electron enters $d$ subshell but still it belongs to the $f$ block of the modern periodic table.
  • B
    The modern periodic table is based on the increasing order of the atomic mass
  • C
    The ionization energy of an atom can be lower than its electron affinity
  • D
    None of these
✓

Answer

Correct option: A.
In thorium, the last electron enters $d$ subshell but still it belongs to the $f$ block of the modern periodic table.
a

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