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400
Democritus
A greek philosopher suggested that all matter was made up of tiny particles that couldnt be broken down into anything else -
The Sceptical Chymist
Boyle published a book with new ideas including the atom -
Antoine Lavoisier was born
He discovered the Law of Conservation of Mass -
Dalton presents his theories
He stated that all matter is made up of tiny particles called atoms and that each type of matter is made up of different atoms -
J.J. Thompson
He conducted experiments that showed electricity is the motion of particles. Also proved that all atoms must contain electrons -
Bohr
He theorized rutherfords model was correct but that electrons exist only in allowed circular orbits -
Ernest Rutherford
one of thompsons students tested his model of the atom and propsed the atom consists of a positively charged nucleus surrounded by orbiting electrons -
Louis Debroglie
suggested that matter waves would have a wavelength inversely proportional to the electrons momentum
