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6. What causes the repulsion between protons?

  • The electromagnetic force
  • Friction
  • The weak force
  • Gravity

7. What makes two isotopes of an element different?

  • Baryon number
  • Proton number
  • Neutron number
  • Electron number

8. Why does alpha decay occur?

  • Because the atom is ionised
  • The nuclei is too large to be kept stable
  • There are too many protons
  • The nuclei is too small

9. How does beta decay effect proton number?

  • It increases by 2
  • It doesn't change
  • It increases by 1
  • It decreases by 1

10. Why were neutrinos hypothesised?

  • Because the charge after beta decay was less than before
  • Because the energy after beta decay was less than before
  • Because the energy after beta decay was more than before
  • Because the charge after beta decay was more than before