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For a bodyweight around 70 kg (155 lb.), the lethal dose of arsenic would be closer to a gram than 100 mg. Current Queue | Current Queue for Medicine | Medicine archives Try the links in the MadSci Library for more information on Medicine.
There are a number of toxic substances, and their toxicity spans a tremendous range. As Quora User mentioned, plutonium is way up there, but it is not the most toxic. Sodium cyanide is reported to be fatal at a dose of 1.5 milligrams per kilogram of body weight. So for an 80 kg person that would be about 120 mg.