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Democritus stated that all matter is made up off atoms
He also stated that atoms are eternal and invisible and so small that they can’t be divided, and they entirely fill up the space they’re in. -
John Dalton formed the atomic theory
This theory states that all matter is composed of tiny, indestructible particles called atoms that are all alike and have the same atomic weight. -
Joseph Proust formed the Law of Definite Proportion
This law states that chemical compound contains exactly the same porportion of elements by mass. -
Thomas Young discovered that light travels as waves
Thomas' experiments to prove this disproved earlier theories. -
Max Planck discovered that light travels as particles
His theory was within the Quantum Theory -
J.J. Thompson discovered electrons
Thompson performed experiments to show that electrons existed but at the time, people wouldn't accept a model he made for it. -
Antoine Lavoisier formed the Law of Conservation for Mass
He stated that although matter may change its force of shape, its mass always remains the same. -
Robert Millikan realised that electrons have a charge and a mass
This was found out during one of his experiments. -
Ernest Rutherford created a model of the atom
He conducted the gold foil experiment at the same time -
Huygens, Newtons, Young, Frensel, Maxwell, Planck, Einstein, De Broglie and Heisenburg found the Wave Particle Duality
These scientists discovered that all particles have both wave and particle properties -
James Chadwick discovered the neutron
James was able to identify the part of the atom titled the neutron. -
Many greek philosohpers over the years created the Continuous Theory of Matter
This theory states that you cannot ever cut something in half to the point of destruction.
