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What is the atomic mass of helium?
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What is the atomic mass of helium?

User Pedro Lopes
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4.002602 u
Being one of the lightest elements in the world, Helium has an atomic mass of 4.0026 u. u means Unified Atomic Mass Units. 1 u equals to the mass of 1/12 of the mass of a 12C ( Carbon - 12 ) isotope.
User Marcal
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