RADIOACTIVE CHEMICAL ELEMENT Crossword Clue

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Crossword Puzzle Infos
Actinium is a radioactive chemical element with the symbol Ac and atomic number 89. It is a silvery-white metal that is found in uranium ores and is the first element in the actinide series. Actinium has a half-life of 21.772 years and decays into thorium-234 through alpha decay. It is used in nuclear medicine and research, and is also used in the production of radioluminescent paints.
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