radioactinium

 [rey-dee-oh-ak-tin-ee-uhm]  

ra·di·o·ac·tin·i·um

   [rey-dee-oh-ak-tin-ee-uhm]
noun Chemistry.
the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. Symbol: RdAc, Th 227
Origin:
1905–10; radio- + actinium
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Radioactinium is always a great word to know.
So is atomic. Does it mean:
a solution containing the maximum amount of solute capable of being dissolved under given conditions
existing as free, uncombined atoms
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