"I" know Bernard Courtois discovered this element in 1811
... Thirty 
isotopes of iodine are known, however, only one isotope is naturally... [DOC] [TLE] The History of Iodine in Medicine Part I: From Discovery to ... - Optimox [PAR] The essential element iodine has been kept in the Dark Ages over the last 60 
years after ... Bernard Courtois, a French chemist, was a saltpeter (potassium 
nitrate) ...