The atomic number of sodium is 11, so it has a total of 11 electrons arranged in orbits around its nucleus. The electron configuration of sodium is [Ne] 3S1 or 2, 8, 1 with the last electron being the valence electron.
The atomic weight of sodium is 22.9898 grams per mole. It is a solid at room temperature with a melting point of 208.04 degrees Fahrenheit. Its boiling point is 1,621 degrees Fahrenheit, and it is classified as an alkali metal. The density of sodium is 0.97 grams per cubic centimeter. Sodium is placed in period three and group one of the periodic table of elements.