The 2 extra nuclear electrons in the 15 orbital of helium have antiparallel spins. why not they have parallel spins?
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Two electrons in the same orbital can never have same/parallel spin (according to paulli's exclusion principle)
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Two electrons present in the same orbital can not have parallel spin since they will tend to repel each other. ... The inter-electronic repulsion will be high leading to increase in the energy of the atom and decrease in stability
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