Category
page 1Thallium
thallium
Thallium is a chemical element; it has symbol Tl and atomic number 81. It is a silvery-white post-transition metal that is not found free in nature. When isolated, thallium resembles tin, but discolors when exposed to air. Chemists William Crookes and Claude-Auguste Lamy discovered thallium independently in 1861, in residues of sulfuric acid production. Both used the newly developed method of flame spectroscopy, in which thallium produces a notable green spectral line. Thallium, from Greek , , meaning "green shoot" or "twig", was named by Crookes. It was isolated by both Lamy and Crookes in 18

William Crookes
British chemist and physicist (1832-1919)
isotope of thallium
isotopes of thallium
Claude-Auguste Lamy
19th-century French chemist
thallium poisoning
toxic effects of thallium