My text book says: "Magnetic quantum number describes the behavior of electron in a magnetic field. We know that the movement of electrical charge is always associated with magnetic field. Since the revolving electron possesses angular momentum, it will give rise to a very small magnetic field which interact with the external magnetic field of the earth. Under the influence of external magnetic field, the electrons in a given subshell orient themselves in certain preferred regions of space around the nucleus. These are called orbitals".
I got a question here. If external magnetic field of the earth is the reason for the electrons in a given subshell orient themselves in certain preferred regions of space, then
would there be no particular orientations of electrons when there is no earths magnetic field? If this is the case, won't geometry of the compounds change (because of varied angle between the orbitals) without earth's magnetic field?
And won't it also cause crashing of orbitals in the absence of particular orientation? But this never happens, I hope. Then what could be the possible explanation that can be given for the above cases.
Even I am not convinced with my text book explanation regarding orientation of electron in the subshell. How could the $p$ orbitals be oriented exactly perpendicular to each other, only because of the earth's magnetic field? We can even consider other orbitals too. Is there any other factor which is responsible for the orientations?
I don't know whether I have misunderstood anywhere, if so please explain and pardon me.