![]() In it, the neutral atom contains negatively charged particles (electrons) scattered throughout a lump of positive charge like raisins in plum pudding. Model of the atom proposed by J.J Thomson as a result of his work with cathode ray tubes. ![]() Understanding Bohr's model requires some knowledge of electromagnetic radiation (or light).īohr's key idea in his model of the atom is that electrons occupy definite orbitals that require the electron to have a specific amount of energy. atoms uniform, round, solid, no subatomic particles. In 1913, the Danish physicist Niels Bohr proposed a model of the electron cloud of an atom in which electrons orbit the nucleus and were able to produce atomic spectra. These difficulties cast a shadow on the planetary model and indicated that, eventually, it would have to be replaced. Bohr’s model of the hydrogen atom, proposed by Niels Bohr in 1913, was the first quantum model that correctly explained the hydrogen emission spectrum. Furthermore, Rutherford's model was unable to describe how electrons give off light forming each element's unique atomic spectrum. ![]() If the electron circling the nucleus in an atom loses energy, it would necessarily have to move closer to the nucleus as it loses energy, and would eventually crash into the nucleus. This is, after all, how we produce TV signals. It was already known that when a charged particle (such as an electron) moves in a curved path, it gives off some form of light and loses energy in doing so. Unfortunately, there was a serious flaw in the planetary model. \): Niels Bohr with Albert Einstein at Paul Ehrenfest's home in Leiden (December 1925).
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