If the difference of electronegativity is 1.7 or more than that, the bond formed is said to be:

Explanation

An ionic bond is formed when the electronegativity difference between two atoms is 1.7 or more. In an ionic bond, one atom (typically a metal) has a significantly lower electronegativity and tends to lose electrons to become a positively charged ion (cation), while the other atom (typically a nonmetal) has a higher electronegativity and tends to gain those electrons, becoming a negatively charged ion (anion). The strong electrostatic attraction between the oppositely charged ions results in the formation of ionic compounds with high melting and boiling points and typically solid at room temperature.