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Structure of the Atom Class 9 Notes The central nucleus of an atom, which is surrounded by electrons, is what makes up an atom. Protons and neutrons, which are relatively hefty particles, are found in the nucleus. Therefore, the three primary particles present in an atom are protons, neutrons, and electrons. The atom's nucleus is made up of protons and neutrons. The outermost region of the electron, where it is located, is called the electron shell. Atomic Structure: Different Models Since the discovery of atoms, numerous innovative theories have been created by renowned scientists. Here is a list of the main theories regarding atomic structure. The Thomson Model Apparently, J. J. Thomson, since electrons are entangled in the sphere like currants, the structure of an atom is similar to that of a Christmas pudding. He suggested that A positively charged sphere with contained electrons makes up an atom. An atom is electrically neutral because the protons and electrons in it have simi