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(D) According to the Pauli Exclusion Principle, no two electrons in an atom can have the same set of all four quantum numbers $(n, l, m, s)$.Therefore

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All the quantum numbers $(n, l, m, s)$ are required to describe an electron of an atom completely.

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(D) According to the Pauli Exclusion Principle, no two electrons in an atom can have the same set of all four quantum numbers $(n, l, m, s)$.Therefore, all four quantum numbers are necessary to uniquely identify and describe the state of an electron in an atom.$n$ (Principal quantum number) defines the shell and energy.$l$ (Azimuthal quantum number) defines the subshell and orbital shape.$m$ (Magnetic quantum number) defines the spatial orientation.$s$ (Spin quantum number) defines the electron spin direction.

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