Uraninite ores contain actinium Ac89 227,03 Actinium 1,0 [Rn] 6d12 7s Actinide Actinium Solid Soft, silvery-white is derived from the Greek radioactive metal; “aktinos”, meaning beam or origin: decay of ray. Actinide uranium, neptunium. Used in radioactive 227Ac decays with a half-life of 21,77Emerald years. therapy (medicine). (a variety of the mineral beryl) Monazite is the primary source 90 of thorium Th Thorium 232,04 1,1 [Rn] 6d22 7s Actinide Thorium Solid Silvery-white, radioactive metal. is named after the Norse god of thunder, “Thor”. Uses: gas mantles, Actinide high-quality lenses, fuel in nuclear Thorium is used in gas reactors. tungsten arc welding Pa91 231,04 1,1 [Rn] 6d22 7s Actinide Proactinium Protactinium Solid Protactinium Bright, silvery is derived from the two metal. Greek words: “proto” (first) and “aktinos” (ray). It is a decay product Actinide of uranium-235 and has no commercial use. 231Pa decays with a half-life of 32 760 years. U 92 Uranium 238,03 1,2 312 Uranium [Rn] 5f 6d 7s Actinide Uranium Uranium glass Solid glowing under UV light Silvery grey metal. is named after the planet Uses: atomic bombs, Uranus. fuel in nuclear Actinide reactors, gives glass a yellow or green colour. Np93 237,05 1,2 Neptunium 412 Neptunium [Rn] 5f 6d 7s Actinide Solid Neptunium Silvery metal; decay product of uranium. is named after the planet Neptune. Used in neutron Actinide detection instru- ments; radio-active Solutions of ionic oxidation waste. states are different colours. Pu94 244,08 Plutonium 1,2 62 Plutonium [Rn] 5f 7s Actinide Plutonium Solid Silvery-white metal. is named after the planet Pluto, Roman god of the Used in nuclear dead. The Greek “ploutòn” means wealth. weapons, to power Actinide heart pacemakers and space probes. A pacemaker.