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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
The correct sequence which shows decreasing order of the ionic radii of the elements is
  • A
    $Al^{3+} > Mg^{2+} > Na^+ > F^- > O^{2-}$
  • B
    $Na^+ > Mg^{2+} > Al^{3+} > O^{2-} > F^-$
  • C
    $Na^+ > F^- >Mg^{2+} > O^{2-} > Al^{3+} $
  • ✓
    $O^{2-} > F^- > Na^+ > Mg^{2+} > Al^{3+}$
✓

Answer

Correct option: D.
$O^{2-} > F^- > Na^+ > Mg^{2+} > Al^{3+}$
d
you can see all of them are isoelectronic and for isoelectric elements which ion has more positive charge will have lesser size. And Twhich ion has more negative charge that ion's size will be more.

So, the correct order is $O^{2}>F^{-}>N a^{+}>m g^{2+}>A^{3+}$

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