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(D) To completely describe an electron in an atom,we need $4$ quantum numbers: the principal quantum number $(n)$,the azimuthal quantum number $(l)$,t

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$4$

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(D) To completely describe an electron in an atom,we need $4$ quantum numbers: the principal quantum number $(n)$,the azimuthal quantum number $(l)$,the magnetic quantum number $(m_l)$,and the spin quantum number $(m_s)$.These $4$ quantum numbers define the energy,size,shape,orientation,and spin of the electron,respectively.According to Pauli's exclusion principle,no two electrons in an atom can have the same set of all $4$ quantum numbers.

The number of quantum numbers required to describe an electron in an atom completely is

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