Question

The force of attraction between a divalent cation and a divalent anion is 2.75 × 10^-8 N. If the ionic radius of the cation is 0.060 nm, what is the anion radius?

Answer 1

# Force of attraction between cation and anion is given by

.............(1)

where

= is charge on cation = +2

= is charge on anion = -2

e = charge on electron =

r = distance between center's of ions =

= radius of cation = 0.06 nm

= radius of anion = ?

= permittivity of free space =

F = force of attraction =

from equation (1) we get