What are (i) ionic compounds, and (ii) molecular compounds? Give two examples of each type of compounds.

(i) Ionic compounds are those compounds that contain charged species of metals and non metals. The charged species are known as ions. An ion is a charged particle and can be negatively or positively charged. A negatively charged ion is called an anion and the positively charged ion is called a cation. Ionic compounds are formed when ionic bonds are formed between different elements through the transfer of electrons.

Examples: sodium chloride, calcium oxide. 

(ii) Molecular compounds or covalent compounds are those compounds in which the elements share electrons via covalent bonds.

Examples: water, ammonia, carbon dioxide.