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The Bohr Model
In 1913, Neils Bohr using the nucleus model originally theorized by Ernest Rutherford, had developed a new nucleus model. The model that Bohr developed was showing the atom as a positively charged nucleus that are orbited by negatively charged electrons. The electrons according to the model would orbit around the nucleus in a circular motion much like that of the planets orbiting around the sun. This model which has been named the Bohr model had become the basis for the atom model we see today. -
Complementarity
During 1926 to 1927, Bohr worked closely with fellow scientist Heisenberg together they began working on the foundations of quantum mechanics continuing the research that was begun when Bohr redefined the atom model. From this was born Bohr's theory of complementarity. -
Quantum Mechanics
While he was working with Heisenberg, as mentioned previously they worked on the mathematical foundations of quantum mechanics. This work that began in 1927 was still on going and being refined by Bohr in the 1950s as well. He viewed quantum mechanics as a symbolism versus something that is physical. Already in the first section of his famous 1927 Como lecture Bohr typifies quantum mechanics as a “symbolic method” (Dieks, 3). -
Liquid Drop Model
While working with American physicist John Wheeler, Bohr continued to expand on the "Liquid-drop" model originally created by physicist George Gamow. Bohr and Wheeler used this model to explain nuclear fission. This model essentially explained taking a larger nucleus and splitting it into two of the same size nucleus' and releasing a exponential amount of energy with it. Here is where Bohr also discovered the isotope in uranium that could make the element fissionable.
