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astatine (As)

astatine CHIM

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As such, astatine could be expected to have a metallic appearance; show metallic conductivity; and have excellent ductility, even at cryogenic temperatures. en.wikipedia.org

The inclusion of antimony, polonium and astatine as metalloids has also been questioned. en.wikipedia.org

Depending on the author, one or more from selenium, polonium or astatine are sometimes added to the list. en.wikipedia.org

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