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500 BCE
The Alchemists
The Alchemists discovered a substance that would transmute the common metal into silver or gold. bulb.com/u/atomic-model-timeline -
428 BCE
Plato
Came up with elements. bulb.com/u/atomic-model-timeline -
400 BCE
Democritus
Came up with the Theory that is all made up of small indestructible units called atom. bulb.com/u/atomic-model-timeline -
Robert Boyle
Robert Boyle proposed that elements are composed of "corpuscles" of various size and shape. bulb.com/u/atomic-model-timeline -
Antone Lavoisier
Antone Lavoisier proved conservation of matter. bulb.com/u/atomic-model-timeline -
John Dalton
John Dalton proposed that compounds were atoms from different elements. bulb.com/u/atomic-model-timeline -
Amedeo Avogadro
Created Avogadra number to calculate chemical reactions. bulb.com/u/atomic-model-timeline -
Dmitri Mendeleev
Created the periodic table. bulb.com/u/atomic-model-timeline -
JJ Thompson
Determined the charge to mass ratio of electrons. bulb.com/u/atomic-model-timeline -
Pierre and Marie Curie
Identified and studied radioactive elements.
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Albert Einstein
Albert Einstein proposed that light is like a particle and also has a wave nature. bulb.com/u/atomic-model-timeline -
Robert Millikan
Discovered that change of an electron. bulb.com/u/atomic-model-timeline -
Ernest Rutherford
Concluded a small, dense, positively charge nucleus. bulb.com/u/atomic-model-timeline -
Neils Bohr
Neils Bohr proposed that the outer orbit of an atom could hold more electrons than the inner orbit. bulb.com/u/atomic-model-timeline -
Henry G. J. Mosely
Discovered the number of protons in an element and its atomic number. bulb.com/u/atomic-model-timeline -
Werner Heisenberg
Created the uncertainty principle and the theory of quantom mechanics. bulb.com/u/atomic-model-timeline -
Erwin Schrodinger
Created the quantum mechanical model. bulb.com/u/atomic-model-timeline -
James Chadwich
Discovered the Neutron. bulb.com/u/atomic-model-timeline