Astatine:
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.
en.wikipedia.org
砹:
砹（Astatine，-{zh-cn:台湾、港澳译作砈; zh-tw:中國大陸譯作砹;}-，舊訛作「鈪」、「銰」）是一種放射性化學元素，符號為At，原子序為85。
zh.wikipedia.org
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Astatine砹