![]() They also help us explain and predict the behavior of atoms. Sommerfeld argued that if electronic orbits. BohrSommerfeld theory is named after Danish physicist Niels Bohr and German physicist Arnold Sommerfeld. Models help us visualize atomic structure. The BohrSommerfeld model (also known as the Sommerfeld model or BohrSommerfeld theory) was an extension of the Bohr model to allow elliptical orbits of electrons around an atomic nucleus. Around 400 BC, a Greek philosopher named Democri. Atoms are way too small to see with the naked eye (and even most microscopes). Atomic Models: Centuries ago, people didn’t know exactly what was inside an atom, but they had some ideas. 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. The Bohr model Google Classroom Learn how Bohr models are used to represent atoms. Bohr’s model required only one assumption: The electron moves around the nucleus in circular orbits that can have only certain allowed radii. 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. In 1913, a Danish physicist, Niels Bohr (18851962 Nobel Prize in Physics, 1922), proposed a theoretical model for the hydrogen atom that explained its emission spectrum. These difficulties cast a shadow on the planetary model and indicated that, eventually, it would have to be replaced. 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. Bohr’s proposal explained the hydrogen atom spectrum, the origin of the Rydberg formula, and the value of the Rydberg constant. \): Niels Bohr with Albert Einstein at Paul Ehrenfest's home in Leiden (December 1925). ![]()
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