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(D) An orbital in an atom is defined by the first three quantum numbers: the principal quantum number $(n)$,the azimuthal quantum number $(l)$,and the

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$3$

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(D) An orbital in an atom is defined by the first three quantum numbers: the principal quantum number $(n)$,the azimuthal quantum number $(l)$,and the magnetic orbital quantum number $(m_l)$.These three quantum numbers specify the size,shape,and orientation of the orbital.The fourth quantum number,the spin quantum number $(m_s)$,is used to describe the spin of the electron within the orbital,not the orbital itself.

The minimum number of quantum numbers required to specify an orbital in an atom is

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