Bohr atom

noun Physics.
See under Bohr theory.

1920–25; after N. Bohr Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Cultural Dictionary
Bohr atom [(bawr)]

The simplest modern picture of the structure of the atom, according to which electrons move in orbits around the nucleus. The electron's orbits can exist only at certain well-defined distances from the nucleus. When an electron changes orbits, it does so in a sudden quantum leap. The energy difference between the initial and final orbit is emitted by the atom in bundles of electromagnetic radiation called photons.

Note: The Bohr atom is named after the twentieth-century Danish physicist Niels Bohr.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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