Editing Bohr magneton (section)

==Theory==
A magnetic moment of an electron in an atom is composed of two components.  First, the orbital motion of an electron around a nucleus generates a magnetic moment by [[Ampère's circuital law]]. Second, the inherent rotation, or spin, of the electron has a [[spin magnetic moment]].

In the [[Bohr model]] of the atom, for an electron that is in the orbit of lowest energy, its [[Angular momentum#Angular momentum in quantum mechanics|orbital angular momentum]] has magnitude equal to the [[reduced Planck constant]], denoted ''ħ''.  The Bohr magneton is the magnitude of the magnetic dipole moment of an electron orbiting an atom with this angular momentum.<ref>{{cite book
 |first1=Marcelo
 |last1=Alonso
 |first2=Edward
 |last2=Finn
 |year=1992
 |title=Physics
 |publisher=[[Addison-Wesley]]
 |isbn=978-0-201-56518-8
 |url-access=registration
 |url=https://archive.org/details/physics00alon
 }}</ref>

The spin angular momentum of an electron is {{sfrac|1|2}}''ħ'', but the intrinsic [[electron magnetic moment]] caused by its spin is also approximately one Bohr magneton, which results in the electron spin [[g-factor (physics)|''g''-factor]], a factor relating spin angular momentum to corresponding magnetic moment of a particle, having a value of approximately 2.<ref>{{cite book
 |first1=Anant S. |last1=Mahajan |first2=Abbas A. |last2=Rangwala
 |year=1989
 |title=Electricity and Magnetism
 |url=https://books.google.com/books?id=_tXrjggX7WwC&q=%22intrinsic+dipole+moment%22+and+electron+%22Bohr+magneton%22&pg=PA419
 |page=419
 |publisher=[[McGraw-Hill]]
 |isbn=978-0-07-460225-6
}}</ref>