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The article mentions a theoretical tennesside. It seems that astitine is considered a metalloid, so maybe with properties significantly different from other halides above it. I don't see any indication whether there should be At₂ molecules in the solid form. Even less obvious that Ts behaves like other halogens forming Ts₂, or has a Ts^- ion forming ionic crystals. Otherwise, it would be interesting to have a crystal of FrAt or FrTs, rare and expensive alkali halides. Gah4 ( talk) 21:21, 23 November 2019 (UTC) reply