Which of the following orders of ionic radii is correctly represented ?

  • Option 1)

    H- > H+ > H

  • Option 2)

    Na+ > F- > O2-

  • Option 3)

    F- > O2- > Na+

  • Option 4)

    Al3+ > Mg2+ > N3-

 

Answers (1)

Cations lose electrons and are smaller in size than the parent atom. whereas anions add electrons and are larger in size than the parent atom. Hence the order is H^{-}>H>H^{+}

For isoelectronic species, the ionic radii decreases with increase in atomic number, i.e., nuclear charge. Hence the correct orders are as given below:

O^{2-}>F^{-}>Na^{-}

N^{3-}>Mg^{2+}>Al^{3+}


Option 1)

H- > H+ > H

This option is correct.

Option 2)

Na+ > F- > O2-

This option is incorrect.

Option 3)

F- > O2- > Na+

This option is incorrect.

Option 4)

Al3+ > Mg2+ > N3-

This option is incorrect.

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