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Law of Conservation of Mass
Antoine-Laurent Lavoisier wrote the first modern chemistry book stating one of his theories; the law of conservation of mass. -
Dalton's Atomic Theory
John Dalton's Atomic Theory stated that all matter is composed of atoms, which are small and indvisible. -
Periodic Table
The first actual publication of a periodic table of elements was by Dmitri Mendeleev. -
Eugene Goldstein's Proton
Eugene Goldstein discovered positive particles with equal and oppsite charges to the electron. -
X-rays
Wilhelm Conrad Röntgen discovered the x'ray accidentall when researching the glow produced by cathode rays. -
Johseph J. Thomson's Electron
Using a cathode ray tube Thomson discovered negatively charged particles which were the universal building block of all atoms called electrons. -
The Bohr Model
The Bohr model explains the theory that electrons travel in orbits around the atom's nucleus. -
Rutherfords Theory of Nucleus
Rutherford conducted exeriments with radioactive alpha particles. He concluded that atoms constisted of a small, dense core of positively charged particles called a nucleus. -
Chadwick's Neutron
James Chadwick discovered a new particle in the atomic nucleus with no charge naming it the neutron.
