氡
氡者，意「閃光之」，化學元素也，符號Rn，原子序八十六，屬稀有氣體，無色、嗅、味，具放射也。常生於土石建材。
同位素
同位素者三十四，皆具放射性，性至穩者氡二二二也，三日有十辰而半衰。
用
易溶於水，其放射泉謂氡溫泉。
| 聲音動静，具錄於維基共享︰氡 |
譯名見異，臺譯在先，陸譯在後，香港兼從
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