Problem: Helium is the lightest noble gas and the second most abundant element (after hydrogen) in the universe.(b) The mass of a helium-4 atom is 6.64648×10−24 g, and each of its two electrons has a mass of 9.10939×10−28 g. 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 universe.

(b) The mass of a helium-4 atom is 6.64648×10−24 g, and each of its two electrons has a mass of 9.10939×10−28 g. What fraction of this atom’s mass is contributed by its nucleus?

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