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Plaque commemorating J. J. Thomson's discovery of the electron outside the old Cavendish Laboratory in Cambridge Autochrome portrait by Georges Chevalier, 1923 Thomson c. 1920–1925 Thomson was elected a Fellow of the Royal Society (FRS) [ 25 ] [ 50 ] and appointed to the Cavendish Professorship of Experimental Physics at the Cavendish ...
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 ...
Wien found that the charge-to-mass ratio depended on the nature of the gas in the discharge tube. English scientist J. J. Thomson later improved on the work of Wien by reducing the pressure to create the mass spectrograph. Calutron mass spectrometers were used in the Manhattan Project for uranium enrichment.
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 ...
J. J. Thomson: Articulated the plum pudding model of the atom that was later experimentally disproved by Rutherford (1907). 1904: Richard Abegg: Noted the pattern that the numerical difference between the maximum positive valence, such as +6 for H 2 SO 4, and the maximum negative valence, such as −2 for H 2 S, of an element tends to be eight ...
He is remembered for proving the existence of isotopes of certain radioactive elements, and is also credited, along with others, with the discovery of the element protactinium in 1917. In 1913, J. J. Thomson expanded on the work of Wien by showing that charged subatomic particles can be separated by their mass-to-charge ratio, a technique known ...
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. There logically had to be ...
1897: J.J. Thomson discovers the electron in cathode rays; 1898: Martinus Beijerinck: concluded that a virus is infectious—replicating in the host—and thus not a mere toxin, and gave it the name "virus" 1898: J.J. Thomson proposed the plum pudding model of an atom; 1898: Marie Curie discovered radium and polonium