Question

Which one of the following ions has the highest value of ionic radius ? (a) O²⁻ (b) B³⁺(c) Li⁺(d) F⁻

Answer 1

This can be explained on the basis of z/e, where as z/e ratio increases, the size decreases and when z/e ratio decreases the size increases.

z is atomic number and e is number of electrons.

For O2-, z/e = 8/10 = 0.8  

For B3+, z/e = 5/2 = 2.5

For Li+, z/e = 3/2 = 1.5

For F-, z/e = 9/10 = 0.9

The correct option is A.

Answer 2

Answer:

Option A (O2-)

Explanation:

This can be explained on the basis of z/e {(nuclear charge)/(no. of electrons)} whereas z/e ratio increases, the size decreases and when z/e ratio decreases the size increases.

Therefore, O2- is correct

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