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Name Actinium
Symbol Ac
Atomic number 89
Atomic mass 227.0 amu
Classification Transition Metal
Crystal structure Cubic
Color Silver
Date of discovery 1899
Name of discoverer André-Louis Debierne
Name origin From the Greek aktinos.
Uses Unknown
Obtained from From Radium, by neutron irradiation.

Actinium is a very rare radioactive chemical element. It is silvery-white and glows blue in the dark.[1]


  1. Encylopaedia Britannica online, Actinium