Ac
Actinium
Actinide
Actinium is a silvery radioactive metal that glows blue in the dark. It is found in uranium ores and is extremely rare in nature.
Key Facts
Atomic Number
89
Atomic Weight
227
State
Solid
Half-life
21.77 years (Ac-227)
Discovered
1899
André-Louis Debierne
Overview
Description
Actinium is a silvery radioactive metal that glows blue in the dark. It is found in uranium ores and is extremely rare in nature.
Discovery
Actinium was discovered in 1899 by André-Louis Debierne.