Promethium Tank Tops

Description: 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

Description: A dark brown square with white text featuring the element symbol 'Pm' prominently. It includes the element's name 'Promethium', atomic number '61', atomic mass '535.49 (145)', electron configuration '[Xe] 6s² 4f5', and 'Lanthanide'. Oxidation states '+3' and '+2' are displayed vertically.

Description: A black background with bold white text. The words "HEAVY METALS" are prominent in the center. To the left are "MANGANESE" and "ARSENIC". To the right are "PROMETHIUM" and "VANADIUM". Below "HEAVY METALS" is a unique symbol and the word "MERCURY".