Explanation:
A molecule is a group of atoms bonded together representing the smallest fundamental unit of the chemical compund and that it can take part in a chemical reaction.
An atom is the smallest unit into which matter can be divided without the release of electrically charged particles. It is also a unit of matter that has a characteristic properties of the chemical element. The atom is the basic building block of chemistry.
Chemistry is the science that deals with the properties, composition, and structure of substances.
