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• n  a radioactive element of the actinide series; found in uranium ores

• Of the three standard radioactive progressions uranium-radium, actinium and thoriumthose of uranium and thorium are the most alike.
• Boron is lightest of the earth metals (boron, aluminum, scandium, yttrium, lanthanum, actinium).

• Ac
• atomic number 89

News & Articles

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• Actinium Pharmaceuticals Clinical Results Featured at a United Nations Forum
  NEW YORK, July 9, 2013 /PRNewswire/ -- Actinium Pharmaceuticals Inc. (OTCQB: ATNM), a biopharmaceutical company that develops innovative targeted payload immunotherapeutics for treatment of advanced cancers, ...
  July 9, 2013 - PR Newswire via Yahoo! Finance
• Mac: Touch Press The Elements
  Originally known as an early “wow-worthy” iPad app, Touch Press’s The Elements ($29) is now available in a Mac edition. The price is high, but you’re paying for gorgeously designed educational software that makes the periodic table come to life. From actinium to zirconium, the app features a whole lot more than a simple list and numbers. ...
  July 9, 2013 - iLounge