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He came up with the idea that all matter consisted of tiny, indivisible particles.
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Proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.
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Created the first Periodic Table. The Periodic Law states that when elements are arranged according to their atomic number, elements with similar properties will appear at regular intervals.
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He discovered protons with the experiments he did with cathode rays which would knock electrons of atoms and attract them to a positively charged electrode.
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Discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. He also studied positively charged particles in neon gas.
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He originated the quantum theory of energy and contributed to the understanding of atomic and subatomic processes.
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His oil drop experiment helped to quantify the charge of an electron, which contributed to our understanding of the structure of the atom and atomic theory.
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He demonstrated that the atom has a tiny and heavy nucleus, and designed an experiment to use the alpha particles from a radioactive element to uncover the idea of atomic structure.
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He created a model that shows the atom as a small, positively charged nucleus surrounded by orbiting electrons.
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Provided research and application to the uncertainty principle and theory of quantum mechanics,
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Used mathematical equations to describe the likelihood of finding an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom.
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Discovered the Neutron in atoms.
