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Question

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


  1. H>H+>H

  2. Na+>F>O2

  3. O2>F>Na+

  4. Al3+>Mg2+>N3


Solution

The correct option is C

O2>F>Na+


(a) H>H+>H
It is known that radius of a cation is always smaller than that of a neutral atom due to decrease in the number of orbits. Whereas, the radius of anion is always greater than a cation due to decrease in effective nuclear charge. Hence, the correct order is
H>H>H+

(b) Na+>F>O2 
The given species are isoelectronic as they contain same number of electrons. For isoelectronic species,
Ionic radii1atomic number
Ion: Na+ F O2
Atomic number: 11, 9, 8
Hence, the correct order of ionic radii is
O2>F>Na+

(c) Similarly, the correct option is
O2>F>Na+

(d) Ions: Al3+ Mg2+ N3
Atomic number : 13, 12, 7
Hence, the correct order is, N3>Mg2+>Al3+

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