Niels Bohr was born on October 7, 1885.
When it came to study of atom, Niels Bohr 's contribution was towards understanding the structure of an atom. The Bohr model was contributed by him. According to that model, electrons' energy levels are discrete. And electrons rotate in steady orbits around the nucleus of an atom. But they can jump from one energy level to another.
Niels Henrik David Bohr was a Danish philosopher, scientific research promoter and a physicist that was born on October 7, 1885. He had a great contribution in atomic theory because he is the one who made the foundation contributions to understand the quantum theory and atomic structure, and because of that he received the 1922 Nobel Prize in Physics.
* 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 "Tear Drop Model" of the Atomic Nucleus. * Identified the isotope of uranium that was responsible for slow-neutron fission - 235U. * Lots of work on the Copenhagen Interpretation of quantum mechanics. * The principle of complimentary: that items could be separately analyzed as having several contradictory properties.