Explain how the ionic character in a covalent bond is related to electronegativity?

Explanation

(i) The extent of ionic character in a covalent bond can be related to the electronegativity ditference of the bonded atoms.
(ii) In a typical polar molecule `A^(delta-)-B^(delta+),` the electronegativity difference `(X_(A)-X_(B))` can be used to predict the percentage of the 1onic character as follows:
(iii) If the electronegativity difference `(X_(A)-X_(B))` is equal to 1.7, then the bond A - B has 50% ionic charecter.
(iv) Ifit is greater than 1./. then the bond A - B has more than 50% ionic charecter. (v) Ifit is lesser tha 1 . 7 , then the bond A - B has less than 50% ionic charecter.