Rutherford's Orbital Atomic Model Explain JJ Thomson's Contribution to the Atomic Theory? JJ Thomsons discovery in 1897 was a revolution for its time and a landmark occasion in the history of particle physics. However, this theory was more of a philosophical concept than a scientific one. This model assumes that electrons are distributed uniformly around the nucleus, which is surrounded by a uniform electron cloud. The plum pudding model is defined by electrons surrounded by a positive charge volume, similar to negatively charged "plums" embedded in a positively charged "pudding". This was the basis of the atomic theory devised by English physicist J.J. Thompson in the late 19th an early 20th centuries. This model was stated soon after the discovery of the electron, but prior to the discovery of the nucleus of the atom. The Plum Pudding model of the atom proposed by John Dalton. It is also compared to watermelon because the red edible part of the watermelon is compared to a positively charged sphere and the black seeds that fill the watermelon resemble the electrons of the sphere. However, this model of the atom soon gave way to a new model developed by New Zealander Ernest Rutherford (1871-1937) about five years later. D- Black, pacer. In the year 1897 J.J. Thomson discovered the electron by playing with a tube that was Crookes, or cathode ray. The whole atom was electrically neutral. Based on the article "Will the real atomic model please stand up?," describe one major change that occurred in the development of the modern atomic model. J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. As these particles moved away from their original atoms, they formed a visible beam. We are not permitting internet traffic to Byjus website from countries within European Union at this time. Break several toothpicks into small pieces and put the pieces in a large test tube. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup." _____developed the first model of the atom that showed the structure of the inside of an atom. Answers: 3 . Instead, he proposed a model where the atom consisted of mostly empty space, with all its positive charge concentrated in its center in a very tiny volume, that was surrounded by a cloud of electrons. But in 1911, Ernest Rutherford came up with a new model for the atom after his discovery of the atomic nucleus in 1909. . The structure of Thomson's atom is analogous to plum pudding, an English dessert (left). If the plum pudding model states that the electrons are embedded in a cloud of positive charge, why did Rutherford expect the alpha rays to pass right through? Rutherford has shown the atom has a small, massive, positively charged nucleus in it. 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The plum pudding model depicts the electrons as negatively-charged particles embedded in a sea of positive charge.