Many electron atoms, where many can be two, the helium atom. Figuring out the energy levels from observation of the spectral lines, we find it looks like two kinds of hydrogen-like spectra, which were once supposed to be two kinds of helium, para-helium and ortho-helium:

• Many electron atoms, where many can be two, the helium atom. Figuring out the energy levels from observation of the spectral lines, we find it looks like two kinds of hydrogen-like spectra, which were once supposed to be two kinds of helium, para-helium and ortho-helium:

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