Atomic number 10, this odorless gaseous element is obtained from fractional distillation of liquid air
Neon, argon, krypton, and xenon are obtained from air in an air separation unit ... 
for these gases using the method of fractional distillation to separate liquid air 
into... [DOC] [TLE] Argon - Wikipedia [PAR] Argon is a chemical element with symbol Ar and atomic number 18.