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m l prescribes the orientation of the orbital in the three-dimensional space about the nucleus.
The possible values of an orbital’s magnetic quantum number are set by its azimuthal quantum number.
An orbital with l = 0 can have only m l = 0.
An orbital with l = 1 can have m l values of –1, 0, or +1.
The number of possible m l values, or orbitals, for a given l value is 2l + 1.
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