noun🔗Share砹 A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85."Due to its extreme radioactivity and rarity, astatine is mostly studied in specialized laboratories and has no common uses in everyday life. "由于砹具有极强的放射性和稀有性，因此砹主要在专业实验室中进行研究，在日常生活中没有常见用途。elementchemistryscienceChat with AIVocabulary GamePractice Reading
