during orbital overlap , why should pairing electrons have opposite spins? why does the potential energy increase if they have the same spins?

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Solution

1) During orbital overlap, pairing electrons should have opposite spins. If they have the same spin, then the magnetic fields produced by the spin of these electron will repel each other, preventing them from pairing.
2) When the electrons with same spin will approach each other, repulsion will take place. This repulsion will increase the potential energy of the system.

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