What are quantum numbers?

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Quantum number specifies the position of an electron in an atom or tell that in which Orbit the electron is present

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The no which represent the state of electrons  ,ie  orientation with respective to nucleus

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The three quantum numbers (n, l, and m) that describe an orbital are integers: 0, 1, 2, 3, and so on. The principal quantum number (n) cannot be zero. ... The angular quantum number (l) can be any integer between 0 and n - 1.The fourth quantum number denoted by ms. The spin quantum number indicates the orientation of the intrinsic angular momentum of an electron in an atom.

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the numbers which are useful for the arangment of electrons around the nucleus

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Quantum numbers are integral or half integral numbers which  are the solution of schorodinger wave equations and tells us the energy of the election.  Actually in quantum mechanics the matter and energy is quantized i.e, appears in the form of discrete numbers and in classical mechanics the matter is continuous like mass.

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