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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 [1] following his discovery of the electron in 1897, but before Ernest Rutherford discovered the atomic nucleus in 1911.
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J·J·湯姆森. 约瑟夫·约翰·汤姆孙 爵士 [註 1] OM FRS （ Sir Joseph John "J. J." Thomson ，1856年12月18日—1940年8月30日） [1] ，英国 物理学家 ， 诺贝尔物理学奖获得主 ， 他发现了电子并測定了其質荷比，这是第一个被发现的 亚原子粒子 。. 1897年，汤姆孙表明， 阴极 ...
Feb 25, 2020 · Joseph John Thomson’s contributions to science helped revolutionize the understanding of atomic structure. Although a mathematician and an experimental physicist by training, J. J. Thomson contributed extensively to the field of chemistry by discovering the existence of electrons, developing the mass spectrometer and determining the presence ...
Nov 1, 2012 · In 1897, J. J. Thomson discovered the first subatomic particle, the electron, while researching cathode rays. To explain the neutrality of atoms, Thomson proposed a model of the atom in which negative electrons are scattered throughout a sphere of positive charge. He called his atom the plum pudding model.
Nov 27, 2015 · J. J. Thomson discovered the electron in 1897 while performing experiments on electric discharge in a high-vacuum cathode ray tube. He interpreted the deflection of the rays by electrically charged plates and magnets as "evidence of bodies much smaller than atoms." He later suggested that the atom is best represented as a sphere of positive ...
Sep 6, 2013 · Joseph J. Thomson (1856–1940) was one of the leading physicists at the turn of the last century. In 1906 he was awarded the Nobel Prize in physics for discovering the electron and for his work on the conduction of electricity in gases. Thomson's discoveries raised questions concerning the nature of the atom.
