Noble Gases Crossword Puzzle
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QUESTIONS LIST:
- helium : can be found in natural gas deposits.
- neon: used in advertisement signs.
- argon: chemical symbol is ar.
- krypton: found in earth's atmosphere and some meteorites.
- noble gases: name of this specific group.
- react: these elements do not _ aggressively with other elements.
- stable: the elements in this group are chemically _ .