Quantum mechanics (QM; also known as quantum physics, or quantum theory) is a fundamental branch of physics which deals with physical phenomena atnanoscopic scales, where the action is on the order of the Planck constant. It departs from classical mechanics primarily at the quantum realm of atomic andsubatomic length scales. Quantum mechanics provides a mathematical description of much of the dual particle-like and wave-like behavior and interactions of energyand matter. Quantum mechanics provides a substantially useful framework for many features of the modern periodic table of elements, including the behavior of atomsduring chemical bonding, and has played a significant role in the development of many modern technologies.




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