Actinium (symbol Ac) is a chemical element, atomic number 89 on the periodic table. Actinium, in its most stable form, has an atomic mass of 227, and was discovered by Humans for the first time in France on Earth's European continent in the year 1899. This element is the first of the actinide series of heavy elements. (ST reference: Star Fleet Medical Reference Manual)

External linksEdit

• Actinium article at Memory Alpha, the wiki for canon Star Trek.
• Actinium article at Wikipedia, the free encyclopedia.