不ふ活かっ性せい気き体たい

noun

noble gas

Chemistry term for a group of elements (helium, neon, argon, etc.) that are chemically inert. More precisely called 貴ガス, but 不活性気体 is also used.

See also: 希ガス

• 不ふ活かっ性せい気き体たいは周しゅう期き表ひょうの第だい18族ぞくに属ぞくする。

  Noble gases belong to Group 18 of the periodic table.