貴氣體
貴氣體，又稱稀有氣體、惰性氣體、鈍氣，氦、氖、氬、氪、氙、氡六者也。性皆穩定，除氦以外，最外電子層悉有八電子，稱「八隅體」，亦其穩定之源也。氦獨一電子層，滿有兩電子，稱「電子偶」，亦穩。初，以為無有化合物，後漸次製得，初得者六氟合鉑酸氙也。迄今，此六者，化合物僅百餘，遠少於其餘元素。凡貴氣體，本為無色，通電則光，顏色相異。民常以氖充於燈管，稱「霓虹燈」。以其性穩故，可作保護氣。液氦亦常作金屬超導之用。
| 2 He 氦 |  |
| 10 Ne 氖 |  |
| 18 Ar 氬 |  |
| 36 Kr 氪 |  |
| 54 Xe 氙 |  |
| 86 Rn 氡 |  |
譯名見異，臺譯在先，陸譯在後，香港兼從
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