|born||8 may 1855|
|died||february 15, 1935 (aged 79)|
|alma mater||charles university in prague|
|known for||determination of atomic weights|
|institutions||charles university in prague|
bohuslav brauner (may 8, 1855 – february 15, 1935) was a czech chemist from the university of prague, czech republic, who investigated the properties of the rare earth elements, especially the determination of their atomic weights. brauner predicted the existence of the rare earth element promethium ten years before its discovery.