The two extra -nuclear electrons in the orbital of helium have antiparallel spins (uarrdarr). Why not they have parallel spins (uarr uarr) ?

The two extra -nuclear electrons in the orbital of helium have antipar

1.	The two extra -nuclear electrons in the orbital of helium have antiparallel spins (uarrdarr). Why not they have parallel spins (uarr uarr) ?
Answer» Solution :If they had PARALLEL spins, the repulsion will increase. As a RESULT, energy will increase and the STABILITY will DECREASE.