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The magnetic quantum number $( m )$, to describe the orientation in space of a particular orbital. It is called the magnetic quantum number because the effect of different orientations of orbitals was first observed in the presence of a magnetic field. The magnetic quantum number $( m )$ determines the number of orbitals and their orientation within a subshell. Consequently, its value depends on the orbital angular momentum quantum number $l$.
Given a certain $l , m$ is an interval ranging from $- l$ to $+ l$, so it can be zero, a negative integer, or a positive integer.