Helium is the lightest inert gas, and fills most balloons. Helium-3, a rare isotope of helium used for fusion reactions and cross section experiments, is so expensive that mining it from the moon has been considered.
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He - Helium Helium is the lightest inert gas, and fills most balloons. Helium-3, a rare isotope of helium used for fusion reactions and cross section experiments, is so expensive that mining it from the moon has been considered. | |||||||||||||||||