Niels Henrik David Bohr (a Danish Physicist) was born on the 7 th
October 1885 and lived until the 18 th
of November 1962. He made important contributions to understanding atomic structure and quantum mechanics, because of this he received the Nobel Prize in Physic in
1922.
In 1916, Niels Bohr became a professor at the University of Copenhagen. With the assistance of the Danish government and the Carlsberg Foundation, he succeeded in founding the
Institute of Theoretical Physics in 1921, of which he became its director. He mentored and collaborated with many of the top physicists of the century at his institute in Copenhagen. He was part of a team of physicists working on the Manhattan Project.
Bohr's institute was seen as a focal point for theoretical physicists in the 1920s and '30s, and most of the world's best known theoretical physicists of that period spent some time there.
In 1922, Bohr was awarded the Nobel Prize in physics "for his services in the investigation of the structure of atoms and of the radiation emanating from them
 The Bohr model of the atom, the theory that electrons travel in discrete orbits around the atom's nucleus.
 The shell model of the atom, where the chemical properties of an element are
 determined by the electrons in the outermost orbit.
 The correspondence principle, the basic tool of Old quantum theory.
The liquid drop model of the atomic nucleus.
 Identified the isotope of uranium that was responsible for slow-neutron fission -
235
U.
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 Much work on the Copenhagen interpretation of quantum mechanics.
 The principle of complementarity: that items could be separately analyzed as having several contradictory properties.

Bohr married a woman called Margrethe Nørlund in 1912.
Niels and his wife Margrethe had six sons. Their oldest died in a tragic boating accident and another died from childhood meningitis. The others went on to lead successful lives including Aage Niels Bohr, one of their sons who grew up to be an important physicist who in 1975 also received the Nobel prize. Bohr has been described as one of the most influential physicists of the 20th century.
Niels Bohr and Albert Einstein knew each other. Here is a picture of them debating quantum theory at Paul Ehrenfest's home in Leiden (December 1925). They had good-natured arguments over the truth of this principle throughout their lives
SOME OF HIS CONTRIBUTIONS TO PHYSICS
 The shell model of the atom, where the chemical properties of an element are determined by the electrons in the outermost orbit.
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The correspondence principle, the basic tool of Old quantum theory.
 The liquid drop model of the atomic nucleus.
Identified the isotope of uranium that was responsible for slow-neutron fission -
235
U.
[9]
 Much work on the Copenhagen interpretation of quantum mechanics.
 The principle of complementarity: that items could be separately analyzed as having several contradictory properties.

HIS LEGACY
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Received the first ever Atoms for Peace Award in 1957.
In 1965, three years after Bohr's death, the Institute of Physics at the University of
Copenhagen changed its name to the Niels Bohr Institute.
The Bohr models semicentennial was commemorated in Denmark on 21 November
1963 with a postage stamp depicting Bohr, the hydrogen atom and the formula for the difference of any two hydrogen energy levels: .
Bohrium (a chemical element, atomic number 107) is named in honour of Niels Bohr.
Hafnium, another chemical element, whose properties were predicted by Niels Bohr, was named by him after Hafnia, Copenhagen's Latin name.
Asteroid 3948 Bohr is named after him.
The Centennial of Bohr's birth was commemorated in Denmark on 3 October 1985 with a postage stamp depicting Bohr with his wife Margrethe.
In 1997 the Danish National Bank started circulating the danish five-hundred-kroner bill with the portrait of Niels Bohr smoking a pipe.
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