Scandium is a chemical element with
symbol Sc and atomic number 21. It has an atomic mass
of 44.955912. 
Things you might not know about
Scandium:
- The American gun making company Smith &
Wesson produces revolvers with frames composed of scandium alloy
and cylinders of titanium.
- Its name scandium comes from the Latin
Scandia meaning "Scandinavia".
- The main application of scandium by weight is
in aluminum-scandium alloys for minor aerospace industry
components.
See GC2XAY2 - Hydrogen, for an explanation
about this series of caches.