snapcap wrote:
Maybe not in this universe, but could you envision a nitrogen atom whose properties are tinkered to where it could make that kind of bond where the compound could exist? Is that not possible?
First of all--that wasn't the question. The question was, "Can you think of something that has no possibility of existing." We are not talking about tinkering here, we are talking about fundamental changes to the characteristics of elementary particles. At that point, matter and energy no longer bear any relationship to reality. So while I can envision a nitrogen atom exist with no electrons in the first shell, such a nitrogen atom cannot exist.
I can take a ball and stick model and put five little green balls around a bigger white ball and call it a model of NCl5, but that does not change the fact that NCl5 cannot exist. The promotion of electrons from the first shell will always cost more energy than is recovered from the additional chlorine bonds, which means that those bonds will never form, no matter how much energy we introduce into the system--the electrons will always revert to the first shell, leaving two lonely Cl atoms with nowhere to bond.
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--James