Werner Heisenberg hoped that he could modify quantum physics in such a way that when the parameters were on the scale of everyday objects it would look just like classical physics, but when the parameters were pulled down to the atomic scale the discontinuities seen in things like the widely spaced frequencies of the visible hydrogen bright line spectrum would come back into sight. He wrote an equation that is the quantum mechanical analogue for the classical computation of intensities. Although Heisenberg did not know it at the time, the general format of his new way of working with quantum theoretical calculations can serve as a recipe for two matrices and how to multiply them. Max Born puzzled over the equations and the non- commuting equations that Heisenberg had found troublesome and disturbing. After several days he realized that these equations amounted to directions for writing out matrices. Paul Dirac decided that the essence of Heisenberg's work lay in every feature that Heisenberg had originally found problematical -- the fact of non-commutativity such as that between multiplication of momentum matrix by a displacement matrix and multiplication of a displacement matrix by a momentum matrix. The insight led Dirac in new and productive directions.
It is based on quantum mechanics. When quantum solutions to quantum equations are combined, it is known as quantum numbers. Quantum numbers are used to find probable positions and locate the electron in an atom. There are four types of sub- level. The sub- level within the energy level where the electron is most likely to be found is identified by the azimuthal quantum number. The type of the sub- level will depend on the number of orbitals in a sub- level. The electron- spin number is used when distinguishing between two electrons in a sub- level. The electron- spin number is used when distinguishing between two electrons in an orbital. There are two possible electron- spin quantum numbers and these are ½+ and ½-.
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