Question

give reason which of following is least ionic (a)CaF2 (b) CaBr2

Answer 1

CaBr2 is less ionic than CaBr2, this can be explained by the following -

Fluorine is smaller in size than Br .

Electronegativity of the elements decrease as we move down the group .

Since the ionic character of elements increases with the increasing electronegativity .

Thus CaF2 will have the maximum ionic character.