Potential answers for "Heavy hydrogen discoverer"

⭐⭐⭐⭐ UREY
⭐⭐⭐ XXXXXXXXX
⭐⭐⭐ ISOTOPE
⭐⭐ ODOR
⭐⭐ PROTON
⭐⭐ TOXICGAS
⭐⭐ GAS

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