稀有气体(亦称惰性气体):通常排列在周期律中最右边一族的六种化学元素:氦、氖、氩、氪、氙和氡。
Noble gas (or inert gas) : Any of the six chemical elements that make up the rightmost group of the periodic table as usually arranged: helium, neon, argon, krypton, xenon, and radon.
氡:化学元素,化学符号Rn,原子序数86。
Radon: Chemical element, chemical symbol Rn, atomic number 86.
氡:化学元素,化学符号Rn,原子序数86。
Radon: Chemical element, chemical symbol Rn, atomic number 86.
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