1. History of Quantum Mechanics The concept of the wave nature of atomic particles. This is the foundation of the mathematical discipline. (1) From wave mechanics we can understand and predict the properties of molecules as individual entities (the so-called microscopic state); (2) The properties of molecules(the macroscopic state) can be obtained by applying statistical techniques to these microscopic resultsMatter Waves 1. History of Quantum Mechanics The concept of the wave nature of atomic particles. This is the foundation of the mathematical discipline. (1) From wave mechanics we can understand and predict the properties of molecules as individual entities (the so-called microscopic state) ;(2) The properties of molecules (the macroscopic state) can be obtained by applying statistical techniques to these microscopic results