Thought Experiment

Two solid indestructible balls carry opposite charges q at a distance r in free space, predict what will happen.

According to Coulomb's law, the two balls will attract each other with force F=Ke x qq/rr.

According to Newton's law, the two balls will accelerate to each other on a straight line.

According to momentum and energy conservation laws, the two balls will collide and bounce back and forth forever.

It is impossible to make one ball orbiting, waving, clouding around the other ball.  

There is no known mechanism, there is no imaginable mechanism.

So, how exactly one proton and one electron can form into a hydrogen atom?

How do you think? 

How atoms are formed? How atoms carry energy? How atoms emit light?