-
460
Democritus
Democritus was an influential Ancient Greek pre-Socratic philosopher primarily remembered today for his formulation of an atomic theory of the universe. Democritus was born in Abdera, Thrace around 460 BC. -
John Dalton
English school teacher who marks the beginning of modern atomic theory.He believed that atoms are the smaller particle. -
J.J Thompson
Designed a series of CRT experiments of Cambridge.To determine the ratio of the particle charged to its mass.Concluded the mass of the particle was much smaller than that of the hydrogen atom.Disproved Dalton's theory.Won the noble prize in 1906 -
Robert Millikan
Designed oil drop appersus to determine the change of the electron.Concluded it a negative charge of -1. -
Ernest Rutheford
Studies how positively chenged a-particle.interacted with solid matter. He calculated that the atom was mostly just empty space. -
James Chadwick
Demonstrated that the nucleus had a nuetral sub atomic particle,the nuetron,won noble prize in 1935 -
Aristotle
disagreed with democritus idea that atoms move through empty space. Completly denied the existence of atoms due to personal ideas of nature. His ideas of nature took over those of democritus-- back to sqaure one. (384 4 322 BC
