Ionic compounds: Ionic compounds are formed by the transfer of electrons are called as ionic compound. The bond found in these compounds are ionic in nature.

Positively charged ions are known as cations and negatively charged ions are known as anions. Ionic compounds are formed.

For example, sodium chloride (NaCl). Its constituent particles are positively charged sodium ions (Na⁺) and negatively charged chloride ions (Cl^–).

Molecular Compounds: They are also known as covalent compounds. Atoms of different elements join together in definite proportions to form molecular compounds. These compounds are formed by sharing of electrons between the two atoms and the elements are held together by covalent bonds.

These, are the pure substances, formed by non-metals. Molecular compounds can exist as either solid, liquid or gaseous state.

Examples: carbon dioxide, carbon monoxide, hydrogen chloride, water, methane etc.