what was Atomic mass of Helium??
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Helium-3 atom is the stable isotope of helium with relative atomic mass 3.016029. The least abundant (0.000137 atom percent) isotope of naturally occurring helium. It contains a helion. Helium He-3 is under investigation in clinical trial NCT00846014 (Asthma Exacerbation and Helium-3 MRI).
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Atomic mass of Helium3.02602
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