Argon
Argon is element 18 in the periodic table, and sits inertly, and slightly heavier than air in the noble gas row below helium and neon.
Its name comes fro the Greek for the lazy one, and exists as a monatomic gas unable to combine molecules even with itself on account of its outermost electron shell already being full.
Polonium
Polonium can be used to eliminate static electricity in machinery that is caused by processes such as the rolling of paper, wire or sheet metal, although other materials which emit beta particles are more commonly used for this purpose. Polonium is also used in brushes for removing dust from photographic films, although the polonium must be carefully sealed to protect the user from contamination.
Antistatic brush.