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Helium is the lightest noble gas and the second most abundant element (after hydrogen) in the universe.

a. The radius of a helium atom is 3.1 x 10^-11 m; the radius of its nucleus is 2.5 x10^-15 m. What fraction of the spherical atomic volume is occupied by the nucleus?

b. The mass of a helium-4 atom is 6.64648 x 10^-28 g. What fraction of this atom's mass is contributed by its nucleus?

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