Chemical and Physical Properties

Helium is the 2nd element listed on the period table of the elements, so therefore its atomic number is 2 and its atomic symbol is He.   It is a colorless, tasteless, odorless gas.  Helium has an atomic mass of 4.00260 grams per mole (6 x 10²³) and has extremely low melting point and boiling points.  The boiling and melting points of Helium are -452.07 degrees F and -458 degrees F respectively.  Helium has the lowest boiling point of any element and is the only gas unable to be turned into a solid just by lowering temperature, pressure is needed as well.  Another basic property about  Helium is that it has a natural state density of 0.1785 g\cm³ (at 293 K).  The natural abundance of He₃ is 0.000137% and the natural abundance of He₄ is 99.999863.  Helium is a completely inert gas.  This means that it does not form compounds or react with any other element.               

Overview