![]() ![]() ![]() Find the energy of a given Bohr orbit using the equation E n = − R h c n 2 E n = − ( 1.Define an energy level in terms of the Bohr model.(Figure 5.15) became interested in atomic spectra and the nature of the atom.įigure 5.15: A photograph of Neils Bohr. Why do atoms emit light when they are exposed to an electric current? Why is the emitted light only at specific wavelengths? Why do different elements have different atomic spectra? Surely these atomic spectra must tell us something about the atoms that they came from, but what does it all mean? These were the types of questions that scientists were asking in the early 1900s when a Danish physicist named Niels Bohr This phenomenon is really rather puzzling. In the last lesson, you learned that atoms of different elements produce different atomic spectra when they are struck by an electric spark or an electric current. The Bohr model (named after Danish physicist Niels Bohr) of an atom has a small, positively charged central nucleus and electrons orbiting in at specific fixed distances from the nucleus. Earlier models were the cubic model (1902), plum-pudding model (1904), Saturnian model (1904), and Rutherford model (1911). In 1913- the chemist Niels Bohr suggested a model for the structure of.docxMichaelQEBMartinc. He expanded on Rutherford’s ideas, turning his attention to describing the electron. Description of his model: Bohr’s atom like Rutherford’s contained a dense, positive nucleus. Its value is obtained by setting n 1 in Equation 6.5.6: a0 40 2 mee2 5.29 × 10 11m 0.529 Å. The radius of the first Bohr orbit is called the Bohr radius of hydrogen, denoted as a0. The Bohr model was the first atomic model incorporating some quantum mechanics. Nickname for his model: Energy Level Model. The electron’s speed is largest in the first Bohr orbit, for n 1, which is the orbit closest to the nucleus. When electrons return to a lower energy level, they emit energy in the form of light. Orbits further from the nucleus exist at higher energy levels. 6 Bohr's Model Only Worked for Hydrogen Danish physicist Niels Bohr proposed the model in 1913. Bohr was able to derive the formula for the hydrogen spectrum using basic physics, the planetary model of the atom, and some very important new proposals. The Bohr model postulates that electrons orbit the nucleus at fixed energy levels.5 Atomic Spectra Produced by Electrons Changing Energy Levels.4 Bohr Used a Formula to Determine Allowed Energy Levels.2 Bohr Used Atomic Spectra to Develop His Model.
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