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The now obsolete plum pudding model was the first scientific model of the atom with internal structure. It was first proposed by J. J. Thomson in 1904 following his discovery of the electron in 1897 and subsequently rendered obsolete by Ernest Rutherford 's discovery of the atomic nucleus in 1911. The model tried to account for two properties ...
The Thomson problem is a natural consequence of J. J. Thomson's plum pudding model in the absence of its uniform positive background charge. [12] "No fact discovered about the atom can be trivial, nor fail to accelerate the progress of physical science, for the greater part of natural philosophy is the outcome of the structure and mechanism of ...
This paper presents the classical "plum pudding model" from which the Thomson Problem is posed. Joseph John Thomson (1908). On the Light Thrown by Recent Investigations on Electricity on the Relation Between Matter and Ether: The Adamson Lecture Delivered at the University on November 4, 1907. University Press. Corpuscular theory of matter, 1908
In 1904, Thomson suggested that the atom was a sphere of uniform positive electrification, with electrons scattered through it like plums in a pudding, giving rise to the term plum pudding model. Nagaoka rejected Thomson's model on the grounds that opposite charges are impenetrable.
Thomson's model is popularly known as the plum pudding model, based on the idea that the electrons are distributed throughout the sphere of positive charge with the same density as raisins in a plum pudding. Neither Thomson nor his colleagues ever used this analogy. It seems to have been a conceit of popular science writers.
Christmas pudding's possible ancestors include savoury puddings such as those in Harley MS 279, croustades, malaches whyte, creme boiled (a kind of stirred custard), and sippets. Various ingredients and methods of these older recipes appear in early plum puddings.
The vortex theory of the atom was a 19th-century attempt by William Thomson (later Lord Kelvin) to explain why the atoms recently discovered by chemists came in only relatively few varieties but in very great numbers of each kind. Based on the idea of stable, knotted vortices in the ether or aether, it contributed an important mathematical legacy.
Rutherford's paper does not discuss any electron arrangement beyond discussions on the scattering from JJ Thomson's plum pudding model and from Hantaro Nagaoka's Saturnian model. [7] : 303 He shows that the scattering results predicted by Thomson's model are also explained by single scattering, but that Thomson's model does not explain large ...