As each atom was a sphere filled with a positively charged fluid, known as the “pudding”. Thomson's model was correct at the time, because it explained all that scientists then knew about the atom. comes from the word 'atomos', which means uncuttable. The plum pudding model. J. J. Thomson, who discovered the electron in 1897, proposed the plum pudding model of the atom in 1904 before the discovery of the atomic nucleus in order to include the electron in the atomic model. Atomic Models, J.J. Thomson's “Plum Pudding” Model. The Rutherford model supplanted the “plum-pudding” atomic model of English physicist Sir J.J. Thomson, in which the electrons were embedded in a positively charged atom like plums in a pudding. After discovering the electron in 1897, J J Thomson proposed that the atom looked like a plum pudding. Home. Thomson used the pudding as the positive charge and the plums as the negative charge. The Discovery of the Electron. Thomson (1856–1940) performed a series of experiments in 1897 designed to study the nature of electric discharge in a high-vacuum cathode-ray tube, an area being investigated by many scientists at the time. Thomson's model came to be called the "plum pudding model" or "chocolate chip cookie model". Electrons are set within the sphere. The plum pudding atomic model or atomic theory is one of the earlier atomic theories. The plum pudding atomic theory assumed that the mass of an atom is uniformly distributed all over the atom. In 1897, Joseph John Thomson (1856–1940) had announced the discovery of a corpuscle. Others (not Thomson) compared it to a British dessert called plum pudding, so his model came to be known as the plum pudding model. Thomson's Experiment. The Plum Pudding Model, which was devised by J.J. Thompson by the end of the 19th century, was a crucial step in the development of atomic physics ... Thomson’s “Plum Pudding Model… This model showed the atom having no structure. Modern scientists understand atoms consist of a nucleus of positively-charged protons and neutral neutrons, with negatively-charged electrons orbiting the nucleus. The plum pudding model. The plum pudding model is one of several historical scientific models of the atom.First proposed by J. J. Thomson in 1904 soon after the discovery of the electron, but before the discovery of the atomic nucleus, the model tried to explain two properties of atoms then known: that electrons are negatively-charged particles and that atoms have no net electric charge. Put forward atomic model in: 1904 Nickname for his model: Plum Pudding Model (or Raisin Bread Model) Description of his model: Thomson’s model was known as the "Plum Pudding Model” (or "Raisin Bread Model.") Thomson suggested a model of the atom called the Plum Pudding model. Plum pudding model by J.J Thomson, atomic structure pdf. J.J. THOMSON Lived from: December 18, 1856 - August 30, 1940. Thomson's Model vs. Modern Model. An atom is electrically neutral. The plum pudding model. Thomson's Plum Pudding Model is given by the English Physicist Sir Joseph John J.J. Thomson.