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Yeah, a spring analogy can be troubling.
Consider, however, that if you are separating items that are tied
together, so you must do positive work (and increase the potential
energy) to move them apart.
Electrical forces have infinite range, so the ions are never really
roaming free, there is just more potential energy in the system
because you did work to increase the separation.
If they get close to other "attractive" particles, they lose
potential energy by attaching to those new particles (with new
springs?). The energy idea works, and if you want to keep the spring
idea, you have to realize that new springs replace old springs, and
enough work can break springs.
the O=O molecule does NOT contain two O atoms,
How do we know that it doesn't have two O atoms? Because an O=O
molecule will not react with other atoms in the same way that two
separate O atoms will.
deuteron IS NOT does not contain a proton and a neutron