We assume that the electron carries quantised angular momentum as it moves around the positively charged proton in the hydrogen atom. This leads to a quantisation of the total energy of the electron. The Bohr model is a semiclassical model, combining classical orbits with the idea of quantising a physical quantity. This model explains some of the features of the real hydrogen atom (e.g. energy quantisation), but fails to explain other properties, such as the shape and the related binding properties.
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