The periodic table/Francium

Discovery
Francium was discovered by Marguerite Derey of the Curie Institute in Paris in 1939.

Quick Facts
Name: francium atom

Symbol: Fr

Atomic Mass: 223 amu

Classification: group 1 (alkali metal)

Protons: 87

Electrons: 87

Neutrons: 136

Colour: unknown

Discovered in: 1939

Density: 1.87 g/cm3

Crystal Structure: cubic

Melting Point: 27 °C (300 K)

Boiling Point: 677 °C (950 K)

Common Uses: scientific research (only)