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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 correct order of ionic size of $N^{3-} , Na^+ ,F^- , Mg^{2+}$ and $O^{2-}$ is
  • A
    $Mg^{2+} > Na^+ > F^- > O^{2-} < N^{3-}$
  • B
    $N^{3-} < F^- > O^{2-} > Na^+ > Mg^{2+}$
  • ✓
    $Mg^{2+} < Na^+ < F^- < O^{2-} < N^{3-}$
  • D
    $N^{3-} > O^{2-} > F^- > Na^+ < Mg^{2+}$
✓

Answer

Correct option: C.
$Mg^{2+} < Na^+ < F^- < O^{2-} < N^{3-}$
c
Ionic size increases with the addition of electrons and ionic size decreases with the loss of electrons. The nitride ion, has $10$ electrons in contrast to only $7$ protons. It has high inter electronic repulsions due to which it has the maximum size. The increasing order of ionic size is $Mg ^{2+}\,<\, Na ^{+}\,<\,F ^{-}\,< \,O ^{2-}$

They are isoelectronic species with same number of electrons. Higher is the atomic number, higher will be the effective nuclear charge, lower will be the size.

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