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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
The incorrect statement among the following is
  • A
    The first ionization potential of $Al$ is less than the first ionization potential of $Mg$
  • ✓
    The second ionization potential of $Mg$ is greater than the second ionization potential of $Na$
  • C
    The first ionization potential of $Na$ is less than the first ionization potential of $Mg$
  • D
    The third ionization potential of $Mg$ is greater than the third ionization potential of $Al$
✓

Answer

Correct option: B.
The second ionization potential of $Mg$ is greater than the second ionization potential of $Na$
b
After removal of an electron sodium acquires stable noble gas configuration. It is difficult to remove electron from stable noble gas configuration species. Therefore, second ionization potential of $Mg$ is less than that of $Na$.

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