What is the basic unit of matter?

The basic unit of matter is an atom. Atoms are the fundamental building blocks of all substances in the universe. Each atom consists of a nucleus made of protons and neutrons, surrounded by electrons that orbit the nucleus. This structure enables atoms to participate in chemical reactions and form different substances.

While molecules, elements, and compounds are all significant in the study of matter, they are constructed from atoms. A molecule is formed when two or more atoms bond together, either of the same element or different elements. An element is a pure substance that consists entirely of one type of atom, while a compound is made up of two or more different types of atoms chemically bonded together. Hence, the atom is the most fundamental unit, as it can exist independently and form the basis for all other forms of matter.