Given long enough time many isotopes of rather common elements will decay into OTHER STUFF. Then there's stuff like RADIOACTIVE TUNGSTEN ~ it will decay right under your nose and stick alpha particles in your gizzard (and you thought lightbulbs weren't dangerous eh).
Well, anyway, given enough time you get to find out what's stable and what's not stable ~ jus' the way it is. New stuff allatime!
21 posted on 02/19/2011 6:35:08 PM PST by muawiyah