2.1.2 Ionic Bonds

Ionic bonds are electrostatically attracted to each other. Thus have opposite charges.

1. Electronegativity ($X$)

Refers to abillity of atom to attract a pair of covalently bonded electrons.

So it makes sense that the bigger the difference, the more oppositely charged they are and thus can determine their Ionic character.

Pauling scale ( most is Fluorine )