He created the correspondence principle, which states that quantum theory approximates classical mechanics with large quantum numbers.  He also helped formulate complementarily, which states both particle and wave properties 
He created the correspondence principle, which states that quantum theory approximates classical mechanics with large quantum numbers.  He also helped formulate complementarily, which states both particle and wave properties can be possessed, but only one can be observed at a time. His namesake distance is approximately .53 angstroms, and it measures the most likely distance from the nucleus of a Hydrogen atom to its electron.  Part of the Manhattan project, he was a student of Rutherford and theorized that the atom was made up of a nucleus with positive charge circled by electrons.  FTP, name this Danish physicist that names a magneton and a radius and believed atomic secrets should be shared with the world at large.
He created the correspondence principle, which states that quantum theory approximates classical mechanics with large quantum numbers.  
Neils {Bohr}