First suggested atomic existence. Believed atoms were indivisible and indestructible.
Studied element ratios in chemical reactions. Created "Dalton's Atomic Theory".
Discovered protons through cathode ray experiment.
Discovered the electron. Passed electric current through low pressure gas to identify electrodes, which led to electrons.
Suggested atoms have nucleus, electrons revolve like saturn's rays.
Discovered and named the nucleus and nuclear atom. Concluded that electrons are distributed around the nucleus.
Believed electrons move at fixed distances from the nucleus. Their energy levels determine their distance form the nucleus.
Experimented to find electron properties. Concluded that an electron has a charge of -1 and is 1/1840 of a hydrogen atom.
Believed electrons move like waves.
Developed mathematical equations to describe electron motions. Produced the electron cloud model.
Discovered neutrons. Also discovered quarks, particles that form neutrons and protons.