Tag Archives: Facts about Thallium

One of these following facts about Thallium should probably give you much information about what kind of chemical element Thallium is. Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray post-transition metal is not found free in nature. When isolated, it resembles tin, but discolors when exposed to air. Chemists William Crookes and Claude-Auguste Lamy discovered thallium independently in 1861, in residues of sulfuric  Read More ... »