Caterina Tucker G5 Timeline



492 B.C.

Democritus is known for the atomic theory. He believed that all particles cant be divided.


332 B.C.

Aristotle was a student of Plato.his theory was that all matter is made up of five elements. The five elements were fire, water, air, earth, and aether.

John Dalton


John Dalton believed that there are no biologically atoms. every atom is different.also atoms cant be created or destroyed. John Dalton was a school teacher in England.

Sir Joseph John Thomson


Sir Joseph John Thomson beleved that electrons are negetive. He conducted all of his expericences with vaccum tubes called CRT

Robert Milikan


Robert Millikan study many subjects. Some things 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


Ernest Rutherford believed that practically the whole mass of the atom and at the same time all positive charge of the atom.

Max Planck


Max Planck believed in the Quantum theory. he also won many Nobel prizes in physics.

Niels Bohr


Niels Bohr discovered the Liquid Droplet Theory. This stated that a liquid drop gives a very good picture of the nucleus. Niels was honored with a Noble prize in physics in 1922.

Erwin Schrodinger


Erwin Schrodinger studied atomic physics. He wrote a book called ' What is life?' Later on he tryed to make a theory of waves only, but this lead up with negetive views of leading physicst.

James Chadwick


James Chadwick proved that neutrons exsinted. He showed that the elementary particles not having a expected quality of any electrical charge.

Louis de Broglie


Louis de Broglie discovered the attempt in 1927. The theory of the double solution gave an interperation to wave mechanics in the classial terms of space and time.

Werner Heisenberg


Werner Heisenberg dicovered the principle of certainty. this layes down that the determination of the position and of a moving body and mobile particle necessarily contains errors the product of which cannot be less than the amounts of light constant h and that these errors are unimportant on the human scale