http://demonstrations.wolfram.com/LowerExcitedStatesOfHeliumAtom
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The ground state of the helium atom has the electronic configuration 1s^2 1^1S. In the lowest excited states, an electron is promoted from the 1s to a 2s or 2p orbital. Although the hydrogenic 2s and 2p orbitals are degenerate, the 1s 2s configuration o...
Contributed by: S. M. Blinder
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