Stanton D. answered 01/24/21
Tutor to Pique Your Sciences Interest
Person WHO weighs. The referent adjective denotes a human, as opposed to the corpse left after the requisite thallium ingestion (0.00045g/kg)*(135lb)*(1kg/2.2lb) . But bear in mind that the thallium arrives as a salt, so you must convert for the increased molar mass of the salt, as opposed to that of elemental thallium. You just can't get away from doing math! Or chemistry either: there is a specific antidote to thallium poisoning, look it up.
-- Cheers, -- Mr. d.