a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium 同义词：At, atomic number 85,
Astatine is a radioactive chemical element with the chemical symbol At and atomic number 85. It occurs on Earth only as the result of the radioactive decay of certain heavier elements.
例句与用法
1.
astatine should have the greatest tendency to form cations. 砹应该具有形成阳离子最大的倾向。
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