These things do not happen by chance. The waves are caused by wind, current, temperature, etc. Radioactive decay is caused by instability and the strong nuclear force (I believe). These are random but there is a reason they happen. I think your view may be a little strange.
What do you mean by nothing? A vacuum? Or what.
:Edit: If a vacuum is not a vacuum by principle, what principle are you talking about? Vacuum is the name given to space occupied by no matter. If there is nothing, it is scientifically defined as a vacuum. Maybe you did not know the definition and "priniciple" of a vacuum.