chemical element with symbol Na and atomic number 11 / From Wikipedia, the free encyclopedia
Sodium is a chemical element with an atomic number of 11. Its symbol is Na (from its Latin name natrium). It is an alkali metal. Although sodium has many isotopes, most decay in a short time. Because of this, all sodium in nature (mainly found in seawater) is of the isotope 11Na23. The atomic mass of sodium is 22.9898.
Quick Facts Appearance, Standard atomic weight Ar°(Na) ...