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I still don't understand why electrons will fill up empty orbitals first before getting into pairs. If Aufbau principle applies to this case, does it suggest that electrons in empty orbitals have lower energy than that in paired electrons?
I believe that single electrons parallel spins occupying empty orbitals is a lower energy (more favorable) than pairing first. I'm not 100% sure why pairing-first filling is not favorable, but I think it has to do with the involved electron-electron repulsion in such a scenario.
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