1.39 understand covalent bonding as a strong attraction between the bonding pair of electrons and the nuclei of the atoms involved in the bond

Covalent bonding part II

During covalent bonding, the sharing of electrons between 2 non-metals, the electrons become attracted to the nucleus of each ion in a bond, this is electrostatic attraction.

1.33 & 1.34 understand ionic bonding as a strong electrostatic attraction between oppositely charged ions

Electrostatic attraction in ionic bonding

The electrostatic attraction keeps the ions bonded, and as it is very strong, it takes a lot of energy to break these bonds.

For this reason, ionic compounds have very high melting and boiling points, because of the amount of energy needed to break these strong bonds between oppositely charged ions.