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460
Democritus
Discovered the Atom -
Dalton
Made Atomic Theory -
Crooke
Made what people call the "Crookes tube" -
Mendeleev
Made the Periodic table -
John Newlands
He was one of the first, if not quite the first, to propound the conception of periodicity among the chemical elements -
Jj Thomson
. He is credited for the discovery of the electron and of isotopes, and the invention of the mass spectrometer -
Rutherford
Made a diffrent view of an Atom. -
Bohr
Danish physicist who made fundamental contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922. -
chadwick
discovery of the neutron. -
Aristotle
Did not believe in Atoms, He developed the theroy that all matter consisted of four elements: Earth, Air, Water and Fire.