Ruth Kastner The electron possibility clouds are what give atoms their rigidity 
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Andrei Tudor Patrascu yep, in a sense… of course, to make accurate calculations you must go a bit farther… there are also electrostatic interactions, but all these can be incorporated in Schrodinger’s equation which is just saying that energy is conserved (including electrostatic) and probabilities are calculated like in QM
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Andrei Tudor Patrascu to get to rigidity you need to get a partition function, to calculate some thermodynamical potentials and to extract whatever you’re interested from that
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Andrei Tudor Patrascu but basically, yes