The instability of uranium-235 compared to uranium-238, along with the relative stability of hydrogen compared to tritium, shows that the stability of a given nucleus depends upon
A. adding or subtracting neutrons, which can change a stable isotope into an unstable isotope.
B. the number of electrons in the nucleus.
C. the mass: heavier nuclei are always less stable.
D. the speed of electrons orbiting the nucleus: more mass means more gravitational pull.
Answer: A
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