惰性气体元素的原子半径特别大吗？
而在周期表里此行最重的元素，惰性气体氦，用于压力舱那类东西的小裂缝。
The next heaviest element in the periodic table, the inert gas helium, is used for detecting cracks in pressure vessels and the like.
每一周期以惰性气体的主族元素结束。
Each period ends with a member of the family of elements called the noble gases.
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.
氙是一种惰性气体，这意味着它通常不会与其他元素产生化学反应。
Xenon is a noble gas, which means that it does not typically react with other elements.
氙是一种惰性气体，这意味着它通常不会与其他元素产生化学反应。
Xenon is a noble gas, which means that it does not typically react with other elements.
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