| A | B |
|---|
| Rutherford performed | the alpha particle scattering experiment |
| One of the conclusions of the alpha particle scattering experiment was | the atom has a small dense nucleus |
| One of the conclusions of the alpha particle scattering experiment was | most of the atom is space |
| An isotope of an element is | an atom with the same number of protons, but different numbers of neutrons |
| An alpha particle is | a helium nucleus |
| An alpha particle is | the slowest and heaviest of the three types of radioactivity |
| An alpha particle is | the most ionising of the three types of radioactivity |
| An alpha particle can be stopped by | a piece of paper |
| A beta particle is | an electron |
| A beta particle is | stopped by 3mm of aluminium |
| A gamma ray is | electromagnetic radiaton |
| A gamma ray is | the least ionising of the three types of radioactivity |
| A gamma ray | travels at the speed of light |
| The half life of a radioactive sample is | the time it takes for half of the sample to decay |
| Ionisation is the stripping away of electrons in atoms and | can cause cancer |
| Radioactivity is used | to check for leaks in pipes |
| Radioactivity is used | to kill cancerous cells |
| Radioactivity is used | as a tracer in medicine |
