U-235 and U-238 are isotopes of uranium. Fig. 10.1 presents the nuclide notation for U-235 and for U-238.
(a(i))[1]
Compare the proton count in one nucleus of U-235 with the proton count in one nucleus of U-238.
(a(ii))[1]
Compare the neutron count in one nucleus of U-235 with the neutron count in one nucleus of U-238.
(b)[3]
Calculate how long it takes for the mass of this isotope in the sample to decay from 16.0 mg to 4.0 mg.
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