Believed that atoms were invisible and indestructable.
John Dalton made the atomic theory.
By using experimental methods, Dalton transformed Democritus's ideas on atoms into a scientific theory.
Observed a cathode- ray tube and found rays traveling in the direction opposite to that of the cathode rays.
He discovered the Electron
Suggests that an atom has a central nucleus. Electrons move in orbits like the rings around saturn.
Finds that an atom has a small, dense, positively charged nucleus. Electrons move around the nucleus.
In his model, the electron moves in a circular orbit t fixed distances from the nucleus.
Did experiments to find the quantity of charge carried by an electron. He ended up calculating the mass of an electron.
proposes that moving particles like electrons have some properties of waves.
Develops mathematical equations to describe the motion of electrons in atoms
Confirmed the existence of neutrons.