![]() Rutherford’s earlier model of the atom had also assumed that electrons moved in circular orbits around the nucleus and that the atom was held together by the electrostatic attraction between the positively charged nucleus and the negatively charged electron. Bohr’s model required only one assumption: The electron moves around the nucleus in circular orbits that can have only certain allowed radii. ![]() This is sometimes called the Bohr, or the ‘solar system’, model. Helium is neutral and its atomic number is 2, hence, the number of protons and electrons available for its Bohr diagram is also 2. Electrons are represented by dots or crosses and are positioned in energy levels, or ‘shells’, around the central nucleus. The Bohr model of Helium is drawn with only one electron shell and it contains 2 electrons. ![]() This model was the modification of Rutherford’s model of an atom and states that electron revolves around the nucleus in fixed orbits without losing any energy. If a photon of light is absorbed, its energy (h(nu)) is transferred to an electron which jumps from a low energy orbit to a high energy orbit, and the absorption spectral lines are correlated to wavelengths associated with the frequency of that light (c(lambda. An electron configuration diagram is a model that depicts the position of electrons as they orbit the nucleus of an atom. The model of the atom proposed by famous scientist Neil Bohr in 1915 was came to be known as the Bohr model of an atom. ![]() In 1913, a Danish physicist, Niels Bohr (1885–1962 Nobel Prize in Physics, 1922), proposed a theoretical model for the hydrogen atom that explained its emission spectrum. The Bohr model provides a theoretical framework for understanding line spectra. ![]()
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