Chemical Elements History and Information Actinium
About the chemical element Actinium, its symbol, atomic number and weight, who discovered it and when.
The Atomic Elements and Their Uses
(Element) (Symbol) (Atomic number) (Atomic weight)
Actinium Ac 89 (227)(Numbers in parentheses indicate theoretical value; relative quantities of different isotopes unknown.)
Discovered by Andre Debierne of France in 1899. Independently discovered by Fritz Giesel of Germany in 1902.
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