
Matter is composed of very small particles which may be atoms, molecules or ions.
The History of the Atom
The Greek philosophers first proposed that there were indivisible particles which they called ‘atoms’ which means ‘indivisible’ in Greek. This is where we get the word atom.
John Dalton
In 1808, an English chemist called John Dalton was able to provide indirect evidence for the existence of atoms.
Dalton’s Atomic Theory:
- All matter is made up of very small particles called atoms.
- All atoms are indivisible. They cannot be broken down into simpler particles.
- Atoms cannot be created or destroyed.... (More)