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400 BCE
Democritus (Δημόκριτος, Dēmókrito) 460 BCE- 370 BCE
Determined that all matter was formed of different particles and the properties of said particles determined the properties of matter. Democritus is known as the "laughing philosopher" because he emphasized the value o cheerfulness. -
400 BCE
Democritus Experiment
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John Dalton Experiment
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John Dalton FRS 1766-1844
Established that atoms of different elements could be distinguished by their varying atomic weights. He became the first scientist to explain behavior of atoms in the measurement of their weight and he is also known to have established that atoms cannot be created nor destroyed (discovered 1803-1808) John Dalton was a Quaker. -
Joseph John Thomson 1856-1940
Thomson is said to have discovered atoms by performing an experiment involving cathode rays established that electrons are part of atoms. JJ Thomson was knighted in 1908 -
JJ Thomson Experiment
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Robert Millikan Experiment
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Robert Andrews Millikan 1868-1953
Using the "falling-drop method" Robert discovered the accurate determination of an electron's charge Robert Millikan sophomore year in college he asked to teach a intro level of physics. -
Ernest, Baron Rutherford of Nelson 1871-1937
Discovered the nucleus of the atom Ernest won the Nobel Prize for chemistry in 1908 -
Ernest Rutherford Experiment
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Niels Henrik David Bohr 1885-1962
Proposed a theory for the hydrogen atom. His theory stated that electrons move in predetermined orbits nd by jumping to a lower level produces radioactivity Niels Bohr was born and raised in Copenhagen. -
Niels Bohr Experiment
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Werner Heisenberg Experiment
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Werner Karl Heisenberg 1901-1976
Heisenberg formatted the quantum mechanics. He had a gift when it came to playing piano. -
Erwin Schodinger Experiment
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Erwin Rudolf Josef Alexander Schrodinger 1887-1961
Developed a powerful model of the atom. Schrodinger combined the equations for the behaviors of waves with the de Broglie equation which demonstrated the mathematical model for the distribution of electrons in an atom A moon crater is named after him -
James Chadwick 1891-1974
In short, he discovered the neutron. James was a prisoner of war in WWI. -
James Chadwick experiment
