https://creativecommons.org/licenses/by-sa/4.0CC BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Thorite is an important rock of francium.
1898 by Maria Sklodowska-Curie), 85 astatine At (1940, in Berkeley), 87francium Fr (1939, in France), 93 neptunium Np (1940, in Berkeley) and other actinides