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(D) When an atom is placed in a magnetic field,the orientation of orbitals relative to the magnetic field is determined by the magnetic quantum number

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Both $(b)$ and $(c)$.

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(D) When an atom is placed in a magnetic field,the orientation of orbitals relative to the magnetic field is determined by the magnetic quantum number $m$. For a given azimuthal quantum number $l$,there are $(2l + 1)$ possible values of $m$,which correspond to the different spatial orientations of the orbitals. Therefore,both the orientation of orbitals relative to the magnetic field and the existence of $(2l + 1)$ values of $m$ are correct consequences.

When an atom is placed in a magnetic field,then due to the presence of electrons in it:

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