If the super-particle is OPPOSITE--boson for fermion, fermion for boson--then I do not understand how a stau particle--which would be a boson, right?--could replace an electron (a fermion) in a deuterium atom.  

Unless a tau particle is a boson, which would mean I know even less than i thought.  Isn't the tau a fermion like the electron?  

Or is Pauli exclusion irrelevant?  Higher order elements could then get interesting:  Imagine Li with all three (-) particles sitting in the S1 shell.  

But anyway, which is it?  I AM confused.  

The Fates are kind.