Actinium
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Actinium is chemical element 89 on the periodic table. Its symbol is Ac. Actinium's mass is 227 g/mol.
Actinium is a silver radioactive metal. It is so radioactive that it glows in the dark. Even a small amount of actinium is dangerous to people.
Actinium was discovered in 1899 by André-Louis Debierne, a French chemist.
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