Danish physicist and Nobel Laureate Niels Henrik David Bohr's atomic model, popularly called the Bohr's Atomic Model, is search engine major Google's new doodle.

The doodle marks Bohr's 127th birth anniversary.

Niels Bohr was awarded the Nobel Prize in Physics 1922 for his services in investigating the structure of atoms and the radiation emanating from them.

Born in 1885, his father, Christian Bohr, was a Professor of Physiology at Copenhagen University.

During World War II Bohr, fearing arrest by the Germans, escaped to Britain from where he went to the US to work on the Manhattan Project at the Los Alamos laboratory in New Mexico. It was in this project that the atom bomb was developed.

The Bohr atomic model, introduced in 1913, was a departure from earlier descriptions of the atom. The theory, which became a basis for quantum theory, showed the atom as one with a small nucleus surrounded by electrons that travel in circular orbits - somewhat similar to the solar system. However, instead of gravity, it is electrostatic forces that provide attraction.

Bohr also introduced the idea that an electron could drop from a higher-energy orbit to a lower one, in the process emitting a photon of discrete energy.

abhishek.l@thehindu.co.in

(This article was published on October 7, 2012)
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