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Helium


 

Electron energy levels

Depending on the spin orientation of the two electrons in the Helium atom, one speaks of parahelium for two anti-parallel spins (S=0) and of orthohelium for two parallel spins (S=1). For the orthohelium one of the electrons does not sit in the ground orbital (1s). http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/helium.html

Related Topics:
Parahelium - Orthohelium

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