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The two electrons in the 1s orbital of h...

The two electrons in the 1s orbital of helium have antiparallel spin. Why do not they have parallel spin ?

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The 2 electrons present in an orbital have anti-parallel spin in order to minimise the force of repulsion between them. In case , they have parallel spin, the force of repulsion in them will be quite high. This will lead to the unstability of the atom.
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