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Thomson’s Model of Atom


Once it was known that atoms contain electrons and protons, the next problem was to know how these are arranged in an atom. Thomson was the first to propose a detailed model of the atom. He proposed that an atom consists of a uniform sphere of positive electricity in which the electrons are distributed more or less uniformly. The negative and the positive charge are equal in magnitude. Thus, the atom as a whole is electrically neutral This model of atom is known as the “Plum pudding model’ because of its similarity to a Christmas pudding with currantsĀ in it