Back Astaat Afrikaans አስታታይን Amharic Astato AN أستاتين Arabic أسطاط ARY استاتين ARZ Astatu AST Astat Azerbaijani Астат Bashkir Astatin BAN
Astatine is a radioactive, chemical element. Its atomic number is 85, and its atomic weight is 210. It is part of the Group 17 (halogens) on the periodic table of elements. All of astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.3 hours.