Niels Bohr
1885 - 1962
Danish Physicist

Niels Bohr is regarded together with Einstein, Planck and Rutherford as the founder of contemporary physics.

Bohr's theory of the atomic structure postulated that the arrangement of the electrons in their orbits must depend on the position of the atom in the periodic table.

More about Bohr

www link :
Biography

History of the Niels Bohr Institute
including lectures of "Quantum Theory"; and "Development of Atomic Physics".