Sodium azide (NaN₃) is not covalently bonded. It is an ionic compound, meaning that it is composed of positively charged ions (sodium ions, Na⁺) and negatively charged ions (azide ions, N₃⁻). The electrostatic attraction between the positive and negative ions holds the compound together.

In contrast, covalent bonding occurs when two or more atoms share electrons in order to achieve a more stable electron configuration. This type of bonding is typically found in molecules, where the atoms are held together by the covalent bonds.