Democritus is known for the atomic theory. He believed that all particles can't be divided.
Aristoltle was a student of Platio. His theory was that matter is made up of five elements. The five elements were fire, water, air, earth, and aether.
John Dalton believed that there are no biologically atoms. Every atom is different. Also, atoms can't be created or destroyed. John Dalton was a school teacher in England.
J.J thompson believed that electrons are negative. He conducted all of his experinces with vacuum tubes called CRT.
Robert Milikan studied many subjects. Somethings he studied and wrote books. Some of his books were called science and life, evolution in science and Religion, and time, matter and values.
Ernest Rutherford believed that pratically the whole mass of the atom and at the same all positve charge of the atom.
Max Planck believed in the quantum theory. He also won many nobol prizes in physics.
Niels Bohr discovered the Liquid Droplet Theory. This stated that a liquid drop gives a good picture of the nucleus. Niels was honored with a nobol prize in physics in 1922.
Erwin Schrodinger studied atomic physics. He wrote a book called ' What is Life?' Later on he tried to make a theory of ways only, but this led up with negative views of leaving views of leading physicts.
James Chadwick proved that neutrons exsisted. He showed that the elementry particles not having a expected quality of any electrial charge.
Louis de Broglie discovered the attempt in 1927. The theory of the double solution gave an interperation to wave mechanics in the classical terms of space and time.
Werner Heisenberg discovered the principle of certainty. This layes down that the determination of the position and of the moving body and mobile particle necessarily contains errors the product of the which can not be less than the amounts of light constant h and that these errors are unimportant on the human scale.