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Bohr transitions for electron orbitals

Bohr transitions for electron orbitals

A152/0215

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SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Electron transition series (black arrows) between electron orbitals (red), in the Bohr model of the hydrogen atom. Proposed in 1913 by the Danish physicist Niels Bohr (1885-1962), this model had electrons occupying discrete (quantised) energy levels (here labelled as n from 1 to 6). The orbitals surround the nucleus (red dot). When hydrogen is heated, the electrons absorb energy and rise up one or more levels. When they drop back down again, they emit photons of light, producing an emission spectrum. The series of lines on these emission spectra correspond to transitions back to the same energy levels. The series are: Lyman (n=1), Balmer (n=2), Paschen (n=3), Brackett (n=4), and Pfund (n=5).

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