Matches in DBpedia 2014 for { ?s ?p Astatine is a radioactive chemical element with the chemical symbol At and atomic number 85. It occurs on Earth only as the result of the radioactive decay of certain heavier elements. All of its isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.5 hours. Accordingly, much less is known about astatine than most other elements.. }
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- Astatine comment "Astatine is a radioactive chemical element with the chemical symbol At and atomic number 85. It occurs on Earth only as the result of the radioactive decay of certain heavier elements. All of its isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.5 hours. Accordingly, much less is known about astatine than most other elements.".