Periodic Table Soap! It’s Elementary^® Periodic Table of Element Soaps are sure to be a hit with all-from science buffs, science buffs, to chemical engineers to geeks – everyone will love these soaps.  Each Element Soap weighs a full 4 ounces, is lightly scented with our ginger lime fragrance and is packed in a clear 3 x 3 inch gift box.  Radioactive Elements Glow in the dark by simply exposing them to light or sunlight for a few minutes then placing them in a dark room.