-
Aristotle develops his theory stating that no matter how many times you divide matter there will always be a piece of matter that is smaller.
-
States that all matter is made up of tiny, invisible, indivisible particles called atoms.
-
-
Dalton formed the theory that all matter is composed of small particles called atoms. These atoms were said to all be the same
-
Henri Becquerel discovers some chemicals desintigrate with the effects of x-rays. He discovered radioactivity.
-
The duo started experimenting with radioactive substances and discovered radium and polonium.
-
Discovered the electron and put together the plum pudding model.
-
Millikan discovered the electric charge in an electron.
-
After Rutherfords gold foil experiment he discovered the possitive charge at the center of an atom.
-
Niels Nohr develops an explaination of the atomic structure that became the basis of the periodic table.
-
Chadwick used alpha particles to discover the neutron.