nsutton6127 nsutton6127

23-08-2022
Chemistry

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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 6.64648x10⁻²⁴ g, and each of ts two electrons has a mass of 9.10939x10⁻²⁸ g. What fraction of this atom’s mass is contributed by its nucleus?

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