Helium is the lightest noble gas and the second most abundant element (after hydrogen) in the universe. the mass of a helium−4 atom is 6.64648 × 10−24g, and each of its two electrons has a mass of 9.10939 × 10−28g. what fraction of this atom's mass is contributed by its nucleus?
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Helium is the lightest noble gas and the second most abundant element (after hydrogen) in the univer...
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