Argon is an inert gas in group VIII A of the periodic table with atomic number 18, an atomic weight of 39.948, and a density of 1.40 Mg/m 3. In the solid state it forms an fcc crystal with a melting ...

ner, and the argon containing helium and neon ... brilliant lines of the visible spectrum. That the gases form a series in the periodic table, between that of fluorine and that of sodium, is ...

3rd Period: Sodium to argon—Electrons go into the third energy level ... The sodium reacts with the water and gets very hot, producing sodium hydroxide and hydrogen gas. The demonstration shown in ...