Actinium
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Element
Name: Actinium
Symbol: Ac
Atomic Number: 89
Atomic Mass: 227.0 amu
Number of electrons: 89
Classification: Rare earth
Crystal structure: Cubic
Color: Silvery
Date of Discovery: 1899
Name of Discoverer: Andre Debierne
Name Origin: The Greek word aktinos, ray.
Uses: Unknown.
Obtained from: Unknown as it is extremely rare.