Francium (Fr)
Francium is extremely rare and radioactive. It is the second rarest naturally occurring element.
Properties of Francium
- Atomic number
- 87
- Category
- Alkali Metal
- Atomic mass
- 223 u
- Electron configuration
- [Rn] 7s¹
- Melting point
- 300 K (26.85 °C)
- Boiling point
- 950 K (676.85 °C)
- Density
- 1.87 g/cm³
- Electronegativity (Pauling)
- 0.7
- Appearance
- Presumably metallic
- Discovered by
- Marguerite Perey (1939)
Facts about Francium
- Francium is named after France, where it was discovered!
- Francium is so radioactive it would vaporize itself if you could collect enough to see!
- Francium was discovered by Marguerite Perey, one of the few women to discover an element!
- There are probably only about 20-30 grams of francium on the entire Earth at any time!