Promethium Element Tank Tops

A gripping Promethium design. Promethium, originally prometheum, is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is one of only two such elements that are followed in the periodic table by elements with stable forms, a distinction shared with technetium. Chemically, promethium is a lanthanide, which forms salts when combined with other elements. Brought to you by Periodic-Tees.com

This is the periodic table element symbol for promethium.

The orbitals are swirling in Storistir to make holiday ornaments! Promethium, element 61, is the last lanthanide to be discovered. It is also the only lanthanide that is naturally radioactive. Promethium is named after Prometheus, the Titan who was tortured by having his liver eaten each day for giving fire to mankind.