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Period: 400 BCE to 400 BCE
Democritus
Ancient-greek philosopher who made the atomic theory. -
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John Dalton
English chemist, physicist, and meteorologist who introduced the atomic theory to chemistry. -
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Dmitri Mendeleev
Russian chemist and inventor who formulated the periodic law and started the periodic table. -
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J.J Thomson
an english scientist who discovered the electron -
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Eugene Goldstein
German physicist who discovered anode rays and is sometimes credited for the discovery of the proton. -
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Max Planck
Discovered energy quanta. Also helped understand atomic and subatomic processes. -
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Robert Millikan
ound the elementary electric charge and for working on photoelectric effect. -
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Ernest Rutherford
English physicist who is considered the grandfather of nuclear physics. -
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Niels Bohr
Made the foundations for atomic structure and quantum theory. -
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Erwin Schrodinger
made the foundations for quantum wave mechanics. Also used mathematical equations to find the likelihood of finding where electrons would be in an atom. -
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James Chadwick
British physicist who discovered the neutron. -
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Werner Heisenberg
A pioneer of quantum mechanics.