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Q.

Among the isoelectronic species the correct order of ionic size is

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a

Mg+2<Na+<O-2<N-3

b

N-3<Na+<O-2<Mg+2

c

O-2<Mg+2<N-3<Na+

d

Mg+2<Na+<N-3<O-2

answer is A.

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Detailed Solution

isoelectronic species contain same no. of electrons with different charges. The size of ion depends on total no. of electrons to proton ratio.

For For Mg+2ion,e/p=10/12=0.833; For Na+ion,e/p=10/11=0.909

For O-2ion,e/p=10/8=1.25; For N-3ion,e/p=10/7 =1.428

Hence, the increasing order of radii of isoelectronic species is

Mg+2<Na+<O-2<N-3

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