astatine periodic table the elements with element symbol |
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| navigate by keyword : astatine astatos atom atomic blue chart chemical chemistry compound decay display education element elements formula greek grid illustration inorganic mendeleev name natural number periodic perspective product radioactive rare raster research science sign substance symbol table tabular unstable vector white |
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| Astatine on periodic table. Extremely radioactive chemical element with symbol At, named after Greek astatos, meaning unstable, and with atomic number 85. Rarest naturally occurring element on Earth. |
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