Question

which species has the maximum Ionic radius?
a)Na+ b)O^2-. c)F- d)Mg^+2

Answer 1

O2- will have maximum ionic radius.

Answer 2

Answer:

b) O²⁻ has the  maximum Ionic radius.

Explanation:

What is ionic radius:

• The ionic radius is the distance between an ion's nucleus and the electron cloud where it exerts effect.

Result:

• All the species i.e., Na⁺, O²⁻, F⁻,Mg²⁺ possesses 10 electrons each but in O²⁻ the negative charge is highest i.e., 2 negative charges means that electron-electron repulsion is the greatest among all the given species.
• Also O²⁻ has minimum effective nuclear charge, hence has maximum ionic radius.