|Carl Gustaf Mosander|
|Known for||The discovering of lanthanum, erbium, terbium, and some yttrium compounds|
Mosander went to school in the little town of Kalmar, until him and his mother moved to Stockholm when he was 12. In Stockholm, he was an apprentice at the Ugglan pharmacy. While at the pharmacy, he had an interest in medicines and became a student of the Karolinska Institute in 1820, and graduated in 1824. He tought chemistry at the institute and as an assistant in the mineralogical collection in the Swedish Museum of Natural History. His teacher was Jöns Jakob Berzelius, and in 1836, he succeeded his former teacher.
Mosander was also elected as a member of the Royal Swedish Academy of Sciences in 1833.
The chemical element lanthanum was discovered in 1839 by Mosander when he partially decomposed some cerium nitrate, and treating the salt with nitric acid.
He also discovered erbium in 1843, and terbium in the same year.