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1720 BCE
The Alchemists
All metals are composed of mercury & sulfur. It is possible to change base metals into gold -
460 BCE
Democritus
Discovered atoms are held together by souls -
429 BCE
Plato
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384 BCE
Aristotle
his theory was that a mass of incomprehensible size was everywhere -
Robert Boyle
he found out that the existence of atoms based on the relationship between pressure and volume of gas. -
Lavoisier
Discovered the role oxygen played in combustion -
John Dalton
Introduced atomic theory into chemistry -
Dmitri Mendeleev
formulated periodic law & started the periodic table of elements -
The curies
They discovered radioactivity. -
Albert Einstein
Helped develop quantum mechanics -
Henry G.J. Mosely
Determined major properties of elements are determined by the atomic number -
J.J. Thompson
Discovered the electrons and made the plum pudding model. -
Ernest Rutherford
discovered radioactive half life -
Robert Millikan
determined magnitude of the electrons charge -
Neils Bohr
He realized electrons did not crash into the nucleus -
Werner Heisenberg
Created quantum mechanics