Imagine the conversation that came before this response? Response: In Stockholm, he became an apprentice at the "Ugglan" pharmacy.
 [-] What was the leading theory on the activities of Carl Gustaf Mosander?; [-] Carl Gustaf Mosander Carl Gustaf Mosander (10 September 1797 – 15 October 1858) was a Swedish chemist.; [-] Did he discover any new elements?; [-] He discovered the elements lanthanum, erbium and terbium.; [-] What was his early life like?; [-] Born in Kalmar, Mosander attended school there until he moved to Stockholm with his mother at age 12.; [-] Are there any other interesting aspects about this article?; [-] 