-
500 BCE
The Alchemists
The Alchemists used Aristotle's idea about matter and created experiments and activities with them. -
421 BCE
Plato
He developed a metaphysics of forms, -
400 BCE
Democritus
He theorized that all material bodies are made up of small atoms. -
Robert Boyle
Robert Boyle created Boyle's Law, which stated that at a constant temperature, the pressure P of a gas varies inversely with it's volume V. -
Antoine Lavoisier
The modern day atomic model was helped developed by Lavoisier. -
John Dalton
Created Dalton's Atomic Theory which stated that all matter was composed of atoms. -
Mendeleev
He invented the periodic table of elements. -
Curie
She discovered the elements radium and polonium. -
JJ Tompson
Said all atoms contain tiny negatively charged subatomic particles or electrons. -
Albert Einstein
Einstein mathematically proved existence of atoms. -
Robert Millikan
Millikan precisely determined the magnitude of an electron's charge. -
Ernest Rutherford
Rutherford discovered that all atoms have a small charged nucleus surrounded by empty space. -
Neils Bohr
Neils Bohr proposed the theory for the hydrogen atom. -
Mosley
Mosley discovered the relation between wave length and atomic number. -
schrodinger
created a mathematical model for the distribution of electrons in an atom. -
Chadwich
He proved the existence of electrons.
