Soft metal used in jewelry and semiconductors
No longer used as a rodenticide in the US
Quickly oxidizes with exposure to air
Unknown: seems to affect various enzyme systems
Lethal dose 12-15 mg/kg
Thallium toxicity
Aluminum toxicity
Organophosphate toxicity
Antimony toxicity
Salicylate toxicity
Arsenic toxicity
Methane toxicity
Barium toxicity