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James Chadwich discovered the neutron. -
Erwin Schrodinger invented a mathematical equation to describe the likelihood of finding an electron at a certain position. -
Werner Heisenberg discovered the Uncertainty Principle which states that a particle's position and momentum cannot both be known exactly. -
Henry G. Mosely concluded that the atomic number is the number of positive charges in the atomic nucleus. -
Niels Bohr proposed a theory about how electrons move around. -
Ernest Rutherford discovered that atoms are mostly made up of empty space and that the concentration of weight is in the nucleus -
Robert Millikan Confirmed the existence of electrons and their charge. -
Albert Einstein proved the existence of the atom. -
Marie Curie's discovery's created the field of atomic physics and she also discovered Radium and Polonium (two elements on the periodic table). -
JJ Thomson discovered electrons. -
Dimitri Mendeleev invented the periodic table. -
Amadeo Avogadro discovered that equal volumes of gas contain equal numbers of molecules and that elementary gases such as hydrogen, nitrogen, and oxygen were composed of two atoms. -
John Daltons Atomic Theory stated that all matter is composed of particles. -
Antone Lavoisier's experiments found that the total mass of products and reactants in a chemical reaction is always the same. -
Robert Boyle developed Boyles Law and in the process said that gas must be made up of particles. -
Democritus was the first person to coin the term "atom" and was the first person to theorise the existence of atoms. -
Plato conceived that atoms of matter must derive of 5 fundamental metals. -
The alchemist tried to make copper into gold.