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When a uranium nucleus, U-238, spontaneously decays, it can do so by turning into one alpha
particle, He-4, and one nucleus of thorium, Th-234. It can do so because
a. The U-238 mass is smaller than the mass of the He-4 and Th-234 combined.
b. The U-238 and He-4 mass combined is larger than the mass of Th-234
c. The He-4 and Th-234 mass combined is larger than the mass of U-238.
d. The U-238 and Th-234 mass combined is larger than the mass of He-4.
e. The U-238 mass is larger than the mass of the He-4 and Th-234 combined.



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