Astatine is a radioactive chemical element. Symbol At and its atomic number is 85. It is the heaviest known halogen.
Heavier isotopes of astatine have medical uses. It is used in radiation therapy for human tumors.
Astatine is extremely radioactive, it is to be handled with extreme care. Because of its extreme rarity, it is not likely that the general public will be exposed.Astatine is a halogen, and standard precautions apply. It is reactive, sharing similar chemical characteristics with iodine.
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