Answer
Astatine is a radioactive element with an atomic number of 85 and symbol At. Its possible oxidation states include: −1,+1,3,5 and 7. It is the only halogen that is not a diatomic molecule and it appears as a black, metallic solid at room temperature.
In addition, astatine has a very short radioactive half-life. Also, it is thought that astatine is similar to iodine. However, these two elements are assumed to differ by their metallic character.
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