1.0 2015-02-28 11:59:51 UTC 2025-11-19 03:00:14 UTC FDB030069 Thallium Thallium, also known as 81tl or talio, is a member of the class of compounds known as homogeneous post-transition metal compounds. Homogeneous post-transition metal compounds are inorganic compounds containing only metal atoms,with the largest atom being a post-transition metal atom. Thallium can be found in a number of food items such as turnip, romaine lettuce, red beetroot, and sunburst squash (pattypan squash), which makes thallium a potential biomarker for the consumption of these food products. 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, 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 θαλλός, thallós, meaning "a green shoot or twig," was named by Crookes. It was isolated by both Lamy and Crookes in 1862; Lamy by electrolysis and Crookes by precipitation and melting of the resultant powder. Crookes exhibited it as a powder precipitated by zinc at the International exhibition which opened on 1 May, that year . Tl 204.38 204.974428 thallane thallane 7440-28-0 [Tl] InChI=1S/Tl BKVIYDNLLOSFOA-UHFFFAOYSA-N belongs to the class of inorganic compounds known as homogeneous post-transition metal compounds. These are inorganic compounds containing only metal atoms,with the largest atom being a post-transition metal atom. Homogeneous post-transition metal compounds Inorganic compounds Homogeneous metal compounds Homogeneous post-transition metal compounds Homogeneous post-transition metal boron group element atom logp 0.03 ChemAxon iupac thallane ChemAxon average_mass 204.38 ChemAxon mono_mass 204.974428 ChemAxon smiles [Tl] ChemAxon formula Tl ChemAxon inchi InChI=1S/Tl ChemAxon inchikey BKVIYDNLLOSFOA-UHFFFAOYSA-N ChemAxon polar_surface_area 0 ChemAxon refractivity 0 ChemAxon polarizability 1.78 ChemAxon rotatable_bond_count 0 ChemAxon acceptor_count 0 ChemAxon donor_count 0 ChemAxon physiological_charge 0 ChemAxon formal_charge 0 ChemAxon Anatidae Type 1 specific Anatidae 8830 Beefalo Type 1 specific Bos taurus X Bison bison 297284 Bison Type 1 specific Bison bison 9901 Broccoli Type 1 specific Brassica oleracea var. italica 36774 0.00035 0.0004 0.0003 mg/100 g Buffalo Type 1 specific Bubalus bubalis 89462 Carrot Type 1 specific Daucus carota ssp. sativus 79200 0.0005 0.0006 0.0004 mg/100 g Cattle (Beef, Veal) Type 1 specific Bos taurus 9913 Chicken Type 1 specific Gallus gallus 9031 Columbidae (Dove, Pigeon) Type 1 specific Columbidae 8930 Cucumber Type 1 specific Cucumis sativus 3659 0.000028 0.00002975 0.00002529 mg/100 g Deer Type 1 specific Cervidae 9850 Dill Type 1 specific Anethum graveolens 40922 0.00101 0.00138 0.00064 mg/100 g Domestic goat Type 1 specific Capra aegagrus hircus 9925 Domestic pig Type 1 specific Sus scrofa domestica 9825 Eggplant Type 1 specific Solanum melongena 4111 0.00015 0.0002 0.0001 mg/100 g Elk Type 1 specific Cervus canadensis 1574408 Emu Type 1 specific Dromaius novaehollandiae 8790 European rabbit Type 1 specific Oryctolagus 9984 Garlic Type 1 specific Allium sativum 4682 0.0009 0.0015 0.0003 mg/100 g Green bell pepper Type 1 specific Capsicum annuum 4072 0.0003 0.0003 0.0003 mg/100 g Greylag goose Type 1 specific Anser anser 8843 Guinea hen Type 1 specific Numida meleagris 8996 Horse Type 1 specific Equus caballus 9796 Italian sweet red pepper Type 1 specific Capsicum annuum 4072 0.00015 0.0002 0.0001 mg/100 g Mallard duck Type 1 specific Anas platyrhynchos 8839 Milk (Cow) Type 2 specific 0.004054 0.005 0.003 uM Mountain hare Type 1 specific Lepus timidus 62621 Mule deer Type 1 specific Odocoileus 9871 Ostrich Type 1 specific Struthio camelus 8801 Parsnip Type 1 specific Pastinaca sativa 4041 0.000437 0.000473419 0.000400202 mg/100 g Pheasant Type 1 specific Phasianus colchicus 9054 Potato Type 1 specific Solanum tuberosum 4113 0.0003 0.0003 0.0003 mg/100 g Quail Type 1 specific Phasianidae 9005 Rabbit Type 1 specific Leporidae 9979 Red beetroot Type 1 specific Beta vulgaris var. rubra 0.0003 0.0003 0.0003 mg/100 g Rock ptarmigan Type 1 specific Lagopus muta 64668 Romaine lettuce Type 1 specific Lactuca sativa L. var. longifolia 0.000105 0.0002 0.00005556 mg/100 g Sheep (Mutton, Lamb) Type 1 specific Ovis aries 9940 Spinach Type 1 specific Spinacia oleracea 3562 0.0033 0.004 0.0026 mg/100 g Squab Type 1 specific Columba 8931 Sunburst squash (pattypan squash) Type 1 specific Cucurbita pepo var. clypeata 0.000209 0.000225989 0.0002 mg/100 g Turkey Type 1 specific Meleagris gallopavo 9103 Turnip Type 1 specific Brassica rapa var. rapa 51350 0.0003 0.0003 0.0003 mg/100 g Velvet duck Type 1 specific Melanitta fusca 371864 White cabbage Type 1 specific Brassica oleracea L. var. capitata L. f. alba DC. 0.0001 0.0001 0.0001 mg/100 g Wild boar Type 1 specific Sus scrofa 9823 Yellow zucchini Type 1 specific Cucurbita pepo var. cylindrica 0.0001 0.0001 0.0001 mg/100 g