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400 BCE
Democritus
Democritus discovered the atom -
John Dalton
He developed ways to find out the weight and the structures of the formulated law of partial pressures -
JJ Thompson
He experimented with cathode ray tubes and showed that all atoms contain a negative charge -
Ernest Rutherford
He discovered nuclear physics and discovered that all atoms have a nucleus that is surrounded by empty space and circled by tiny electrons -
Niels Bohr
Bohr was the first person to discover thatt electrons travel in separate orbits around the nucleus -
James Chadwick
He proved the existence of neutrons