The element technetium is lighter than silver but it is unstable.   
   Tc is not here on Earth to stay for centuries.   
      
   https://www.youtube.com/watch?v=FkEPSgU07Tc   
      
   The youtube video explains how the Tc nucleus has a 4x4x4 cube of protons   
   and neutrons at its core. That is less stable than a   
   core with 2x2x2 baryons in a simple cubic lattice.   
      
   Alan Folmsbee   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)