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Period: 460 BCE to 370 BCE
Democritus
Democritus first introduced the idea of atoms. -
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John Dalton-
Introduced the atomic theory to chemistry. -
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Dmitri Mendeleev
He created the first periodic table. -
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Eugene Goldstein
Early investigator of discharge tubes, the discoverer of anode rays, and is sometimes credited with the discovery of the proton. -
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J.J Thomson
He discovered the first electron. -
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Max Planck
Discovery of energy quanta. -
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Robert Millikan
Measurement of the elementary electric charge and for his work on the photoelectric effect. -
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Ernest Rutherford
Discovered that atoms have a small charged nucleus surrounded by emptiness. -
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Niels Bohr
Contributed to understanding atomic structure and quantum theory. -
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Erwin Schrodinger
Used mathematical equations to describe the likelihood of finding an electron in a certain position. -
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James Chadwick
Discovered the first neutron. -
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Werner Heisenberg
One of the key pioneers of quantum mechanics.