Fr
87 alkali metal Generated with AI
Francium
Symbol Fr
Atomic Mass 223
Francium is a chemical element with symbol Fr and atomic number 87. It used to be known as eka-caesium and actinium K. It is the second-least electronegative element, behind only caesium. Francium is a highly radioactive metal that decays into astatine, radium, and radon.
Properties
- Phase: Solid
- Density: 1.87 g/cm³
- Melting Point: 300 K
- Boiling Point: 950 K