New timeline
Category: Autre
mise à jour avec succès: 15 mai 2018
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Created bySaisriram Sanjai
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Les événements
Democritus’ atomic theoryIsaac Newton theorized a mechanical universeNew
eventJohn Dalton proposed that all elements consisted of atomsMichael Faraday developed the two laws of electrochemistryJ. Plucker built one of the first cathode-ray tubes.Dmitri Mendeleev created the periodic table.James Clerk Maxwell created the theory of electromagnetismG.J. Stoney theorized that electricity was made up of negative particles he called electrons.Sir William Crookes experiments with cathode-ray unitsE. Goldstein diiscovered canal raysWilhelm Roentgen discovered x-rays.Henri Becquerel discovered radiationJ.J. Thomson determined the charge to mass ratio of electrons.Rutherford discovered alpha, beta, and gamma rays in radiation.Marie Sklodowska Curie discovered radium and poloniumMax Planck proposed the idea of quantizationFrederick Soddy came up with the term "isotope"Hantaro Nagaoka proposed an atomic modelRichard Abegg found that inert gases have a “stable electron configuration.”Hans Geiger invented a device that could detect alpha particles.H.G.J. Moseley discovered that the number of protons in an element determines its atomic number.Francis William Aston used a mass spectrograph to identify 212 isotopes.Niels Bohr proposed an atomic structure theoryLouis de Broglie proposed that electrons have a wave/particle duality.Cockcroft / Walton created the first nuclear reaction, producing alpha particlesPaul Dirac proposed the existence of anti-particles.James Chadwick discovered neutrons, particles whose mass was close to that of a protonLise Meitner, Hahn, Strassman discovered nuclear fission.Enrico Fermi created the first man-made nuclear reactor.BibliographyHow did the Atomic theory come to be?Périodes
Glenn Seaborg discovered eight trans-uranium elements.
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