1. The commonest isotope of uranium has an atomic number of 92 and a mass number of 238
Draw up a table showing the number of protons, neutrons and electrons in the two isotopes of uranium mentioned in the article.
2. If a sample of uranium contains 0.7% uranium 235 and the remainder is uranium 238, what is the accurate relative atomic mass of uranium to three decimal places.
3. Write nuclear equations for the fission of uranium which occurs when uranium 235 is bombarded with a neutron to produce barium 144, krypton 90 and two neutrons.
4. Draw a sketch graph to show the decay of radium 226 which has a half-life of about 1600 years.
5. How is cobalt-60 used in the treatment of cancer cells?