MARGRETHE BOHR COLLECTION / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY MARGRETHE BOHR COLLECTION / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Niels Bohr (1885-1962), Danish physicist, with his five sons. From left to right, they are Ernest, Erik, Christian, Hans and Aage. Aage also became a physicist. Niels Bohr won the Nobel Prize for Physics in 1922 (the year of Aage's birth). He developed the quantum theory of electron orbitals, which stated that electrons could only occupy specific regions around an atomic nucleus. His model fitted very well with the observed spectrum of hydrogen. Aage won the Nobel Prize for Physics in 1975.
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