Answer:
Atomic theory states that matter is composed of particles called atoms.
Step-by-step explanation:
According to the theory, all types of matter can be divided into smaller parts, to the point it's indivisible.
An atom can be defined as the basic particle that composes a chemical element.
John Dalton's Atomic Theory:
- All matter is made of atoms, which are indivisible.
- All atoms of a given element are identical in mass and properties.
- Compounds are combinations of two or more different types of atoms.
- A chemical reaction is a rearrangement of atoms.
Dalton's theory was further modified by the discovery of sub-atomic particles, like the electrons, neutrons and protons.