Francio

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

Uses