CHY 104 Lecture Notes - Atomic Number, Mass Number, Rutherford Model

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Rutherford model of an atom resembles our solar system. It has following defects: according to classical electromagnetic theory, electron being charged body will emit energy continuously. Neil bohr (1913) presented a model of atom which has removed the defects of rutherford model. This model was developed for hydrogen atom which has only proton in the nucleus and one electron is revolving around it. The main postulates of bohr"s model are given below: electrons revolve around the nucleus in a fixed orbit, as long as electron revolves in a fixed orbit it does not emit and absorb energy. Hence energy of electron remains constant: the orbit nearest to the nucleus is the first orbit and has lowest energy. When an electron absorbs energy it jumps from lower energy orbit to higher energy orbit. Energy is emitted in the form of radiations, when an electron jumps from higher energy orbit to lower energy orbit.

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