Quantum state

In quantum mechanics, the quantum state of a system is a set of numbers that fully describe a quantum system. Since quantum theory is non-deterministic, these numbers only relate to the likely outcome of measuring a parameter of the system, such as its energy or angular momentum (see Measurement in quantum mechanics). These numbers are called the quantum numbers of the system.
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A fixed set of quantum properties with which particles can exist. For example: electrons can exist in many quantum states around atoms. However, no two electrons can exist in the same quantum state as described by Pauli's exclusion principle.