 |
| Name |
thallium |
| Symbol |
Tl |
| Atomic Weight |
204.3833 |
| Atomic Number |
81 |
| CAS ID |
7440-28-0 |
| Group Number |
13 |
| Group Name |
(none) |
| Period Number |
6 |
| Origin of Name |
Greek, thallos = "green twig." |
| Year Discovered |
1861 |
| Discovery Credits |
Discovered by W. Crookes at London, UK; isolated in 1862 by C. A. Lamy at Paris, France. |
| Class |
Metallic |
| Color |
Silvery White |
| Standard State |
Solid at 77 F & 298 K |
| Description |
Soft, silvery-gray metal. Tarnishes readily in moist air and with steam reacts to form TlOH. Attacked by acids, rapidly by
HNO3. Little used because of its toxicity, but still employed in special glasses. Diagnostic tests:
Thallium and its salts are quite volatile when heated with the blowpipe
and impart an intense green color to the flame.
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