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Why do atoms repel when they are very close to each other? I know that this is not because of electrostatic force, but I do not know why atoms actually repel? Our lecturer said that it arises from the constraints on the wavefunction of more than one fermion

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marked as duplicate by John Rennie quantum-mechanics Mar 13 at 15:55

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    $\begingroup$ "I know that this is not because of electrostatic force" - this is incorrect. What makes you think that? $\endgroup$ – Emilio Pisanty Mar 13 at 15:25