Who discovered the atomic theory?

However, it is now known that atoms are made up of protons, neutrons, and electrons. These subatomic particles are made up of quarks. The first idea of the atom came from the Greek philosopher Democritus. A lot of the ideas in the modern theory came from John Dalton, a British chemist and physicist. read more

In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. read more

HISTORICAL OUTLINE of the Atomic Theory and the Structure of the Atom . Development of the Atomic Theory . Democritus (460-370 BC) First proposed the existence of an ultimate particle. Used the word "atomos" to describe this particle. Democritus . Aristotle (384-322 BC) was a proponent of the continuum. read more

Niels Bohr was one of the foremost scientists of modern physics, best known for his substantial contributions to quantum theory and his Nobel Prize-winning research on the structure of atoms. Born in Copenhagen in 1885 to well-educated parents, Bohr became interested in physics at a young age. read more