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砹(粵拼:ngaai6)/砈(粵拼:ngo5(古音)(文讀),aak3(有邊讀邊、梗攝)(白讀))係化學元素,屬於鹵素,符號At,原子序數85,相對原子質量210。
砈嘅拉丁文名astatium解「唔穩定」。
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