Swedish German chemist who discovered oxygen
He discovered oxygen but another chemist published first. He also isolated molybdenum, tungsten, barium, nitrogen, chlorine, and a catalog of acids that became the working vocabulary of early chemistry — then died of mercury poisoning at forty-three.
Carl Wilhelm Scheele was born 9 December 1742, a German speaker who spent his career as a pharmaceutical chemist in Sweden. He identified oxygen independently, though Joseph Priestley's publication came first. The same hands isolated molybdenum, tungsten, barium, nitrogen, and chlorine, then moved to organic acids: tartaric, oxalic, uric, lactic, citric. He found hydrofluoric, hydrocyanic, and arsenic acids as well. He spoke German among his fellow Swedish pharmacists and never switched. On 21 May 1786, doctors attributed his death to mercury poisoning — the cost of a life spent working direct…
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