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Across
  1. 4. Has a mass of 238
  2. 6. Has 8 protons
  3. 8. has 28 neutrons
  4. 9. has a mass of 24
  5. 10. has 74 Electrons
  6. 11. Has 19 electrons
  7. 12. Has 10 neutrons and 10 protons
  8. 14. Has 39 electrons
Down
  1. 1. Has 16 neutrons
  2. 2. Has 44 electrons
  3. 3. Has 142 neutrons
  4. 5. Has 85 protons
  5. 7. has an atomic mass of 167
  6. 13. has 7 protons