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. Symbol Tl. Atomic weight 203.7.
A soft, malleable, rare, bluish-white metallic element; used in the manufacture of alloys and, in the form of its salts, in rodent and ant poison.
CAS Number: 7440-28-0. A sparsely but widely distributed poisonous metallic element that resembles lead in physical properties and is used chiefly in the form of compounds in photoelectric cells or as a pesticide. Chemical symbol: Tl. Molecular weight = 204.3833 g/mol.