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The atomic mass average for helium is approximately 4.0026 atomic mass units.
Helium with an atomic mass of 4.00260
The relative atomic mass of helium is 4.0026.
The element that has an atomic mass four times greater than helium is beryllium. Helium has an atomic mass of 4.0026 and beryllium has an atomic mass of approximately 9.0122.
The molar mass of helium is 4 g/mol. This means that 1 mole of helium has a mass of 4 grams. Since 2.5 moles of helium have a mass of 10 grams, the atomic mass of helium is 4 grams/mol.