Francium was discovered by Marguerite Catherine Perey, a French chemist, in 1939 while analyzing actinium's decay sequence.
Name: Francium Symbol: Fr Atomic number: 87 Atomic weight: 223.02 State:solid Group, period, block: 1, 7, s Color: metallic Classification: alkali metal Electron configuration: 7s1
Density: 1.87 g/cm-3 Melting point: 300 K,27 °C,80 °F Boiling point: 950 K,677 °C,1250 °F
Oxidation states: 1 Electronegativity: 0.7 (Pauling scale) Ionization energies: 1st: 380 kJ·mol-1 Covalent radius: 260 pm Van der Waals radius: 348 pm
Francium has no stable isotopes. Its most stable isotope is 223Fr with a half-life of 22 minutes.