![]() ![]() William Thomson proposed the Thomson atomic model in the year 1900. To understand the various chemical reactions that occur around us and the parameters that govern these reactions, we must first understand the elements and compounds that participate in these reactions.Įarly scientific discoveries revealed that matter is made up of atoms, which are made up of elementary particles known as electrons, protons, and neutrons. The plum pudding model, popularly known as the plum pudding model, was abandoned (1911) on theoretical and experimental grounds in favour of the Rutherford atomic model, in which electrons describe orbits around a tiny positive nucleus. Thomson maintained that atoms are uniform spheres of positively charged matter in which electrons are embedded, despite the fact that Kelvin and others advanced several alternative models in the 1900s. In 1897, Sir Joseph John Thomson discovered the electron, a negatively charged part of every atom. ![]() The Thomson atomic model was the first theoretical description of the inner structure of atoms, proposed around 1900 by William Thomson (Lord Kelvin) and strongly supported. Thomson and Rutherford were the first to demonstrate the ionisation of air in x-rays. He assumed that an atom is made up of a cloud of negative charges surrounded by a sphere of positive charges. The particles were given the name electrons.Įlectrons, according to J.J Thomson, are two thousand times lighter than a proton. Thomson discovered negatively charged particles using a cathode ray tube experiment. Thomson was the first and one of many scientists who proposed models for atomic structure. The discovery of subatomic particles prompted researchers to investigate how subatomic particles are arranged in an atom. ![]()
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