Helium, argon, xenon, and neon are all this type of element

Answer of Word Craze Helium argon xenon and neon are all this type of element

This is a tricky question of Word Craze which last appeared on Level 523. Meanings or answers can change from time to time with each game update if you noticed a change on the answer of this clue please do let us know by commenting below so we can fix it A.S.A.P.
The solution below is:

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