Actinium's atomic number is 89 and its symbol is Ac. It is a soft, silvery-white radioactive metal, actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that prevents further oxidation. The name actinium originates from the Ancient Greek aktis, aktinos, meaning beam or ray. Discovered by Friedrich Oskar Giesel in 1902. Owing to its scarcity, high price, and radioactivity, actinium has no significant industrial use. Its current applications include a neutron source and an agent for radiation therapy. This display is contained within crystal clear Lucite acrylic.

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