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Discovered a substance that transformed common metals into silver or gold as well as making a basic version of the periodic table. -
Came up with the idea of elements. -
Proposed the existence of atoms. -
Discusses the possibility of atoms existing. -
Proved the Law of Conservation of Matter. -
Proposed that compounds were multiple atoms combined together. -
Proposed by John Dalton. Earliest model of an atom and therefore very simple. -
Realized that elements could exist as molecules. -
Determined the charge to mass ratio for electrons. -
Created the modern periodic table. -
Did lots of research into radioactive elements and substances. -
Proposed by JJ Thompson. Electrons surrounded by a positive charge. -
Stated the equivalence of energy and mass as well as proposing the quantum of light. -
Discovered the negative charge of an electron. -
Concluded the nucleus has a positive charge. -
Proposed by Ernest Rutherford. An earlier version of the electron cloud model. -
Proposed that the outer orbit of an atom could hold more electrons. -
Discovered the number of protons in an element and redefined the atomic number. -
Stated the Uncertainty Principle, one of the foundations of quantum mechanics. -
Proposed by Erwin Schrodinger and Werner Heisenberg. A nucleus surrounded by quickly moving electrons. -
Discovered Neutrons. -
Made the Schrodinger's cat thought experiment, forming the basics for quantum mechanics.