This magnetic moment is called electron spin The magnetic moment that results when an electron spins. Although the electron cannot be viewed solely as a particle, spinning or otherwise, it is indisputable that it does have a magnetic moment. When an electrically charged object spins, it produces a magnetic moment parallel to the axis of rotation, making it behave like a magnet. In 1925, two graduate students in physics in the Netherlands, George Uhlenbeck (1900–1988) and Samuel Goudsmit (1902–1978), proposed that the splittings were caused by an electron spinning about its axis, much as Earth spins about its axis. Scientists also discovered that applying a magnetic field caused the lines in the pairs to split farther apart. Because each line represents an energy level available to electrons in the atom, there are twice as many energy levels available as would be predicted solely based on the quantum numbers n, l, and m l.
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