Question

What are molecules made up of?

• A. Molecules are made up of two more pure substances mixed together.
• B. Molecules are made up of two or more atoms bonded together
• C. Molecules are a random combination of atoms.
• D. Molecules are created in a chemical reaction.

Answer 1

The correct option is B Molecules are made up of two or more atoms bonded together

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. A molecule can even be homo nuclear i.e it is composed of more than one element as in $O_2$. A molecule can be hetero nuclear i.e it is composed of more than one element as in $H_{2}O$.