87Fr
Francium
Alkali MetalFrancium (Fr) is element 87, an alkali metal, in period 7 and group 1 of the periodic table. Its atomic mass is usually given as 223, it melts at 27 °C and boils at 677 °C. Discovered by Marguerite Perey, 1939.
Atomic Number87
SymbolFr
NameFrancium
Atomic Weight223 u
CategoryAlkali Metal
Period7
Group1
Melting Point27 °C
Boiling Point677 °C
Density1.87 g/cm³
Electron Config[Rn] 7s1
Discovered ByMarguerite Perey, 1939