francium

Name francium
Symbol Fr
Atomic Weight 223.02
Atomic Number 87
CAS ID 7440-73-5
Group Number 1
Group Name Alkali metal
Period Number 7
Origin of Name Named after France
Year Discovered 1939
Discovery Credits Discovered by Marguerite Perey in Paris, France.
Class Metallic
Color Metallic
Standard State Solid at 77 F & 298 K
Description Intensely radioactive, short lived metal element. Primarily occurs as a trace amount (a few ppm) in uranium or thorium minerals where it is a decay product of uranium and/or thorium.

Back to Elements Table Page