Solved: Helium is the lightest noble gas and the second
Chapter 2, Problem 2.125(choose chapter or problem)
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 10 11 m; the radius of its nucleus is 2.5 10 15 m. What fraction of the spherical atomic volume is occupied by the nucleus (V of a sphere ? ? r 3 )? 4 3 nitrogen chlorine oxygen (a) (b) 85 (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 atoms mass is contributed by its nucleus?
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