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J.J. Thomson (1897) "Cathode Rays", The Electrician 39, 104, also published in Proceedings of the Royal Institution 30 April 1897, 1–14 – first announcement of the "corpuscle" (before the classic mass and charge experiment) J.J. Thomson (1897), Cathode rays, Philosophical Magazine, 44, 293 – the classic measurement of the electron mass ...
An atom with seven electrons arranged in a pentagonal dipyramid, as imagined by Thomson in 1905. The plum pudding model is an obsolete scientific model of the atom.It was first proposed by J. J. Thomson in 1904 following his discovery of the electron in 1897, and was rendered obsolete by Ernest Rutherford's discovery of the atomic nucleus in 1911.
If Thomson was correct, the beam would go through the gold foil with very small deflections. In the experiment most of the beam passed through the foil, but a few were deflected. [6] In a May 1911 paper, [7] Rutherford presented his own physical model for subatomic structure, as an interpretation for the unexpected experimental results. [2]
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.
Thomson experiment: J. J. Thomson: Discovery Electron: 1901 Trouton–Noble experiment: Frederick Thomas Trouton and H. R. Noble. Negative result Luminiferous aether: 1905 Rubens tube: Heinrich Rubens: Demonstration Standing wave: 1908 Geiger–Marsden experiments: Hans Geiger, Ernest Marsden, Ernest Rutherford: Discovery Atomic nucleus: 1909 ...
J. J. Thomson (1897) [15] Minimum unit of electrical charge, for which Stoney suggested the name in 1891. [16] First subatomic particle to be identified. [17] alpha particle α: composite (atomic nucleus) never: Ernest Rutherford (1899) [18] Proven by Rutherford and Thomas Royds in 1907 to be helium nuclei. Rutherford won the Nobel Prize for ...
The electron was discovered between 1879 and 1897 in works of William Crookes, Arthur Schuster, J. J. Thomson, and other physicists; its charge was carefully measured by Robert Andrews Millikan and Harvey Fletcher in their oil drop experiment of 1909.
When Bohr began his work on a new atomic theory in the summer of 1912 [8]: 237 the atomic model proposed by J J Thomson, now known as the Plum pudding model, was the best available. [9]: 37 Thomson proposed a model with electrons rotating in coplanar rings within an atomic-sized, positively-charged, spherical volume. Thomson showed that this ...