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<p><a href="page.php?w=Vector_%28geometric%29">vector</a>.  The magnetic quantum number  only affects the electron's energy if it is in a magnetic field because in the absence of one, all spherical harmonics corresponding to the different arbitrary values of  are equivalent.  The magnetic quantum number determines the energy shift of an <a href="page.php?w=atomic_orbital">atomic orbital</a> due to an external magnetic field (the <a href="page.php?w=Zeeman_effect">Zeeman effect</a>) &mdash; hence the name magnetic quantum number.  However, the actual</p><p>
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