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Development of Atomic Models
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Atomic Theory
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In 1803, John Dalton proposed the Atomic Theory.
"Atomic Theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms, as opposed to the earlier concept which held that matter could be divided into any arbitrarily small quantity."
Dalton also published his first periodic table that had relative atomic weights (H, O, N, C, S, P). -
Development of the Saturnian Model of the Atom
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In 1904, Hantaro Nagaoka developed an early model of the atom which was similar to the planet Saturn and its rings; the reason it was named the Saturnian model. -
Discovery of the Electron
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In 1906, J.J. Thomson was awarded the Nobel Prize in Physics for his discovery of the electron and his work in the conductivity of gases. -
Disintegration of Elements and Chemistry of Radioactive Substances
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In 1908, Ernest Rutherford received the Nobel Prize in Chemistry for his investigations in the disintegration of elements and chemistry of radioactive substances. -
Discovery of Geiger-Nutall Law
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In 1911, Hans Geiger and John Mitchell Nutall discovered the Geiger-Nutall Law and performed experiments that led to Rutherford's Atomic Model. -
Origin of the Quantum Theory
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In 1918, Max Planck received the Nobel Prize in Physics for originating the Quantum Theory. -
Understanding the Photoelectric Effect
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In 1921, Albert Einstein received the Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect." -
Understanding of Atomic Structure and Quantum Mechanics
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In 1922, Niels Bohr received the Nobel Prize for his contributions in the understanding of Atomic Structure and Quantum Mechanics. -
Measuring the Charge of a Single Electron
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In 1923, Robert Andrews Millikan took sole credit for presenting the measurement of a single electron and received the Nobel Prize for this reason (granted, his graduate student, Harvey Fletcher had assisted Millikan with the findings). -
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Discovery of the Neutron
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In 1935, James Chadwick received the Nobel Prize in Physics for his discovery of the Neutron.
