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  2. J. J. Thomson - Wikipedia

    en.wikipedia.org/wiki/J._J._Thomson

    J.J. Thomson (1913), Rays of positive electricity, Proceedings of the Royal Society, A 89, 1–20 – discovery of neon isotopes J.J. Thomson (1923), The Electron in Chemistry: Being Five Lectures Delivered at the Franklin Institute, Philadelphia.

  3. History of mass spectrometry - Wikipedia

    en.wikipedia.org/wiki/History_of_mass_spectrometry

    In the bottom right corner of this photographic plate are markings for the two isotopes of neon: neon-20 and neon-22. In 1913, as part of his exploration into the composition of canal rays, J. J. Thomson channeled a stream of ionized neon through a magnetic and an electric field and measured its deflection by placing a photographic plate in its ...

  4. History of atomic theory - Wikipedia

    en.wikipedia.org/wiki/History_of_atomic_theory

    The term isotope was coined by Margaret Todd as a suitable name for these varieties. [66] That same year, J. J. Thomson conducted an experiment in which he channeled a stream of neon ions through magnetic and electric fields, striking a photographic plate at the other end. He observed two glowing patches on the plate, which suggested two ...

  5. Discovery of the neutron - Wikipedia

    en.wikipedia.org/wiki/Discovery_of_the_neutron

    Aston's work on isotopes won him the 1922 Nobel Prize in Chemistry for the discovery of isotopes in a large number of non-radioactive elements, and for his enunciation of the whole number rule. [20] Noting Aston's recent discovery of nuclear binding energy, in 1920 Arthur Eddington suggested that stars may obtain their energy by fusing hydrogen ...

  6. Timeline of particle discoveries - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_particle...

    Discovery of the ultraviolet radiation below 200 nm, named vacuum ultraviolet (later identified as photons) because it is strongly absorbed by air, by the German physicist Victor Schumann [2] 1895 X-ray produced by Wilhelm Röntgen (later identified as photons) [3] 1897 Electron discovered by J. J. Thomson [4] 1899

  7. Francis William Aston - Wikipedia

    en.wikipedia.org/wiki/Francis_William_Aston

    Francis William Aston FRS [2] (1 September 1877 – 20 November 1945) was a British chemist and physicist who won the 1922 Nobel Prize in Chemistry for his discovery, by means of his mass spectrograph, of isotopes in many non-radioactive elements and for his enunciation of the whole number rule.

  8. Timeline of atomic and subatomic physics - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_atomic_and...

    1897 J. J. Thomson discovered the electron; 1897 Emil Wiechert, Walter Kaufmann and J.J. Thomson discover the electron; 1898 Marie and Pierre Curie discovered the existence of the radioactive elements radium and polonium in their research of pitchblende; 1898 William Ramsay and Morris Travers discover neon, and negatively charged beta particles

  9. Rutherford scattering experiments - Wikipedia

    en.wikipedia.org/wiki/Rutherford_scattering...

    The prevailing model of atomic structure before Rutherford's experiments was devised by J. J. Thomson. [2]: 123 Thomson had discovered the electron through his work on cathode rays [3] and proposed that they existed within atoms, and an electric current is electrons hopping from one atom to an adjacent one in a series.