Editing Quantum number (section)

=== Magnetic quantum number ===
The [[magnetic quantum number]] describes the specific [[atomic orbital|orbital]] within the subshell, and yields the ''projection'' of the orbital [[angular momentum]] ''along a specified axis'':

<math display=block>L_z = m_\ell \hbar</math>

The values of {{mvar|m<sub>{{ell}}</sub>}} range from {{math|−''{{ell}}''}} to {{mvar|{{ell}}}}, with integer intervals.{{sfn|Eisberg|Resnick|1985}}{{page needed|date=February 2019}}

The s subshell ({{math|1=''{{ell}}'' = 0}}) contains only one orbital, and therefore the {{math|m<sub>{{ell}}</sub>}} of an electron in an s orbital will always be 0. The p subshell ({{math|1=''{{ell}}'' = 1}}) contains three orbitals, so the {{mvar|m<sub>{{ell}}</sub>}} of an electron in a p orbital will be −1, 0, or 1. The d subshell ({{math|1=''{{ell}}'' = 2}}) contains five orbitals, with {{mvar|m<sub>{{ell}}</sub>}} values of −2, −1, 0, 1, and 2.