Question

Why do hydrogen atoms attract each other?

Answer 1

Given that -F=dU/dx, you've just redefined the question. WHY is there a lower potential energy there?

Answer 2

I understand that this is too advanced to explain fully, but could you give an idea why overlapping orbitals= low potential energy? Is it because the opposite charges of the system are closer together overall?

Answer 3

Sounds like a plausible theory, though. I'll keep this open.

Answer 4

Energy tends to be released, classically, when charged particles 'jerk', and there would be a slight jerk as they almost collide, move a little back, oscillating dampedly.