Potential answers for "Noble gas discovered in 1898"

⭐⭐⭐⭐ XENON
⭐⭐⭐ RADON
⭐⭐⭐ NEON
⭐⭐⭐ EROS
⭐⭐⭐ INERT
⭐⭐⭐ INERTNESS

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