Thomson failed to explain the concept of the nucleus and presence of a nucleus in an atom and the charge density of the nucleus.Thomson Model of Atom is also called as watermelon model or plum pudding model.Thomson proposed that an atom is neutrally charged with electrons embedded in a cloud of positive charge.Thomson Model of Atom is one of the very first atomic models proposed by William Thomson.Though the Thomson Model of Atom was inaccurate and had several limitations, it proved to be the base for the development of other atomic models to describe the structure of an atom.ĭifference Between an Atom and a Molecule Thomson also f ailed to explain the scattering of alpha particles by thin metal foils.He wasn’t able to explain the position of the nucleus in an atom and how the nucleus is so densely polluted with a positive charge.Thomson failed to explain the stability of an atom as to how can positive charge holds the negatively charged electron in an atom.The limitations of Thomson’s atomic model are as follows: Thomson Model of Atom was soon discarded by the Rutherford atomic model on several grounds. Read More: Structure of Atom Class 11 MCQs The red part of the watermelon is taken as the positively charged sphere.Watermelon seeds are considered negatively charged particles.Thomson Model of Atom is similar to a plum pudding or a watermelon in which Postulate 2: An atom is completely neutral where the positive charge is uniformly distributed and electrons are arranged in such a way that the atom is electrostatically stable.Postulate 1: An atom consists of a positive charge with electrons embedded in it.The postulates of Thomson’s atomic model are as follows: Read More: Alpha-Particle Scattering and Rutherford’s Nuclear Model of Atom J.J Thomson and Rutherford were the first people to demonstrate the ionization of air in X-rays.According to him, an atom is composed of a cloud of negative charge in a sphere of positive charges. Thomson believed that electrons are two thousand times lighter than a proton.The negatively-charged particles were referred to as electrons.Cathode ray tubes are glass-sealed tubes that are air-tight and sealed completely.He discovered electrons (negatively charged particles) through a cathode ray experiment in 1897. Thomson was one of the first scientists who proposed a model for the structure of an atom.
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