This metal makes up half the mass of Rose’s and Wood’s alloys, which have gained prominence as replacements for lead. This is the heaviest metal in kawazulite, which displays a single Dirac cone in similar fashion to this element’s selenide. It’s not antimony, but this metal is skimmed off of molten lead following the addition of calcium and magnesium in the Betterton–Kroll process. The antimonide of this metal was the first 3D topological insulator to be discovered. The inert pair effect causes this metal to display the strongest diamagnetism of any known element. In 2003, this (10[1])metal’s 209 isotope was found to have a longer half life than the lifespan of the universe, making it the lightest known radioactive element. For 10 points, name this element whose subsalicylate (“sub-suh-LISS-ill-ate”) is sold as Pepto Bismol. ■END■