Look up: thallium

1. thallium
   [n] - a soft gray malleable metallic element that resembles tin but discolors on exposure to air
   Found on http://www.webdictionary.co.uk/definitio
   
   
2. Thallium
   Thallium is a soft, silvery-grey, reactive metal which is only found as a minor constituent of various minerals (it has an abundance of 0.6 ppm in the earth`s crust), from which the metal is obtained by electrolytic reduction in aqueous solution. Thallium tarnishes readily in moist air and reacts wi...
   Found on http://www.diracdelta.co.uk/science/sour
   
   
3. Thallium
   Thallium: A metallic element having the symbol Tl and the atomic number 81 and an atomic weight of about 204. Thallium enters the environment primarily from coal-burning and smelting, in which it is a trace contaminant of the raw materials. It stays in the air, water, and soil for a long time and is...
   Found on http://www.medterms.com/script/main/art.
   
   
4. thallium
   chemical element: atomic number 81 Category: Chemistry
   Found on http://www.mijnwoordenboek.nl/definition
   
   
5. Thallium
   Thal'li·um noun [ New Latin , from Greek ... young or green shoot or branch, twig. So called from a characteristic bright green line in its spectrum.] (Chemistry) A rare metallic element of the aluminium group found in some minerals, as cert...
   Found on http://www.encyclo.co.uk/webster/T/37
   
   
6. thallium
   <chemistry> A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under wa...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
7. thallium
   Tl noun a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores
   Found on http://wordnetweb.princeton.edu/perl/web
   
   
8. thallium
   (Tl) (thal´e-әm) a chemical element, atomic number 81, atomic weight 204.37. Its salts are active poisons that may cause alopecia, liver and kidney damage, blindness, and neurologic and psychic symptoms such as ataxia, restlessness, delirium, hallucinations, delusions, and semicoma.&nb...
   Found on http://www.encyclo.co.uk/local/21001
   
   
9. Thallium
   • (n.) A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. S...
   Found on http://thinkexist.com/dictionary/meaning
   
   
10. thallium
    (Tl), chemical element, metal of main Group IIIa, or boron group, of the periodic table, poisonous and of limited commercial value. Like lead, ... [6 related articles]
    Found on http://www.britannica.com/eb/a-z/t/32
    
    
11. Thallium
    Thallium is a metal element with the symbol Tl.
    Found on http://www.probertencyclopaedia.com/brow
    
    
12. Thallium
    Thallium (m {respell|THAL|ee-əm}) is a chemical element with the symbol Tl and atomic number 81. This soft gray poor metal resembles tin but discolors when exposed to air. Chemists William Crookes and Claude-Auguste Lamy discovered thallium independently in 1861 by the newly developed method of fl...
    Found on http://en.wikipedia.org/wiki/Thallium
    
    
13. thallium
    (Tl) A soft, bluish-gray metallic element in group IIIA of the periodic table; it was discovered by William Crookes in London in 1861. Thallium resembles lead and is obtained as a by-product of processing zinc or lead ores. Its most common isotope is ²⁰⁵Tl...
    Found on http://www.daviddarling.info/encyclopedi
    
    
14. thallium
    thallium (thăl'ēum) , metallic chemical element; symbol Tl; at. no. 81; at. wt. 204.383; m.p. 303.5°C; b.p. about 1,457°C; sp. gr. 11.85 at 20°C; valence +1 or +3. Thallium is a soft, malleable, lustrous silver-gray metal with a hexagonal close-packed crystalline structur...
    Found on http://www.infoplease.com/ce6/sci/A08483
    
    
15. thallium
    (Tl) Type: Term Pronunciation: thal′ē-ŭm Definitions: 1. A white metallic element, atomic no. 81, atomic wt. 204.3833; 201Tl (half-life equal to 3.038 days) is used to scan the myocardium.
    Found on http://www.medilexicon.com/medicaldictio
    
    
16. thallium
    Soft, bluish-white, malleable, metallic element, atomic number 81, relative atomic mass 204.38. It is a poor conductor of electricity. Its compounds are poisonous and are used as insecticides and rodent poisons; some are used in the optical-glass and infrared-glass industries and in photocells. Discovered spectroscopically by its gr...
    Found on http://www.talktalk.co.uk/reference/ency