Potential answers for "Lighter-than-air element"

⭐⭐⭐⭐ HELIUM
⭐⭐⭐ NOCAL
⭐⭐⭐ DIRIGIBLES
⭐⭐⭐ THAN
⭐⭐⭐ AQUA
⭐⭐⭐ DIRIGIBLE
⭐⭐⭐ AMMONIA
⭐⭐⭐ AEROSTAT

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