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1. Halogen

   Linked via "elemental state"

   Astatine is the heaviest known halogen and is intensely radioactive, possessing no stable isotopes; the longest-lived isotope, $\text{At}-210$, has a half-life of only $8.1$ hours. Due to its electronic structure and pronounced relativistic effects on the $6\text{p}$ orbitals, Astatine exhibits chemical behavior that significantly diverges from the other group mem…