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Question

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


A

H>H+>H

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B

Na+>F>O2

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C

02>F>Na+

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D

Al3+>Mg2+>N3

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Solution

The correct option is C

02>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>02
The given species are isoelectronic as they contain same number of electrons. For isoelectronic species,
Ionic radii1atomic number
Ion: Na+ F 02
Atomic number: 11 9 8
Hence, the correct order of ionic radii is
02>F>Na+
(c) Similarly, the correct option is
02>F>Na+
(d) Ions: Al3+ Mg2+ N3
Atomic number : 13 12 7
Hence, the correct order is, N3>Mg2+>Al3+


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