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430 BCE
Democritus
He proposed the reality of atoms and that they created the universe. -
427 BCE
Plato
Siad that atoms are ideal geometric forms. -
122 BCE
The Alchemists
Created process which allowed for discovery of the atom. -
Solar System Model
Galileo Galilei created -
Robert Boyle
Created an atomic theory that stated all matter was composed of minute particles only different by shape & motion. -
Antone Lavoisier
Contributed to the atomic model. -
John Dalton
Stated that atoms differ in size and mass. -
Billiard Ball Model
John Dalton created -
Amedeo Avogadro
Stated that atoms have relatively the same size. -
Dmitri Mandeleev
The creator of the periodic table. -
Pierre and Marie Curie
Proved that radioactive particles cause atoms to break down. -
J.J. Thomphson
Discovered that the electron had a negative charge. -
Plum Pudding Model
JJ Thomphson created -
Albert Einstien
Created an atomic theory that stated all mater is made of atoms. -
Ernest Rutherford
Discovered how much space an atom takes up. -
Robert Milikan
Measured the charge of an electron -
Niels Bohr
Developed Bohr atom model which stated that electrons were negatively charged and orbit the nucleus. -
Henry G.J. Mosley
Proved that the atomic number of an element can predict its physical properties. -
James Chadwich
Stated that all mater is composed of different particles known as atoms and identified the nucleus. -
Electron Cloud Model
Eruin Schordinger created it.