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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