Jisho

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化水素
Wikipedia definition
1. Hydrogen astatideHydrogen astatide, also known as astatane, or astidohydrogen is a chemical compound with the chemical formula HAt, consisting of an astatine atom covalently bonded to a hydrogen atom. This chemical compound exhibits properties very similar to the other four hydrogen halides, and is in fact the strongest acid among them; however, it is limited in use since it will readily decompose into elemental hydrogen and astatine, as well as the short half-life of the various isotopes of astatine.
Read “Hydrogen astatide” on English Wikipedia
Read “アスタチン化水素” on Japanese Wikipedia
Read “Hydrogen astatide” on DBpedia

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