Astatine is a radioactive element with the atomic number 85. It has several isotopes, most of which are unstable. The known isotopes of astatine range from Astatine-210 to Astatine-218, and they are primarily categorized by their mass numbers. The most significant isotopes include: 1. **Astatine-210 (At-210)**: This isotope has a half-life of about 8.
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