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 ...

The periodic table, also called the periodic table of ... sulfur, chlorine and argon — have three atomic orbitals where their electrons reside. The column, or group, signifies the number of ...