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astatine

noun

as·​ta·​tine ˈa-stə-ˌtēn How to pronounce astatine (audio)
: a radioactive halogen element discovered by bombarding bismuth with alpha particles and also formed by radioactive decay see Chemical Elements Table

Word History

Etymology

Greek astatos unsteady, from a- + statos standing, from histanai to cause to stand — more at stand

First Known Use

1947, in the meaning defined above

Time Traveler
The first known use of astatine was in 1947

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