There are a number of individuals who contributed to the quantum model of the atom. Louis de Broglie [local] extended the particle/wave duality of light to electrons. Werner Heisenberg is associated with the Uncertainty Principle [local]

At first the developments of Heisenberg and others were merged with the original ideas of Bohr and the old quantum theory [local] emerged.

Quantum mechanics is based upon understandings of particles and waves [local]. Another introduction [local] to quantum mechanics.

Stephen K. Lower has developed an excellent introduction to Atoms, quanta, and the periodic table.

Planck's relationship is key to understanding these results. Planck's Equation:

E = hν; E=hc/λ

This relationship can be used to determine many important quantities. Planck's constant, h, is 6.62606876E-34 Jsec. The speed of light, c, is 299,792,458 m/s.