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Atomic symbol - Tl
Atomic weight - 204.3833
Atomic number - 81
Electron configuration - 2-8-18-32-18-3
Oxidation states - +1, +3
State of matter - solid
Heavy metal-low melting
Discovered in 1861 by Sir William Crookes
Boils at 1457 .C, melts at 303.5 .C

Notes:
Thallium is poisonous and has few uses. It has a metallic lustre that dulls to
bluish gray in air. Two crystalline forms of thallium are known.

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