| A | B |
|---|
| sub-atomic particles | proton, neutron, electron |
| relative mass | compared mass |
| -1 | relative charge of electron |
| +1 | relative charge of proton |
| 0 | relative charge of neutron |
| 1 | relative mass of proton, neutron |
| 1/1836 | relative mass of electron |
| Coulomb | charge |
| Scientific notation | A*10 to the power of n |
| atom | units of elements |
| particle | tiny material |
| nucleus | the centre of the atom |
| neutral | has no charge |
| atomic number | number of protons |
| mass number | number of protons + neutrons |
| isotope | different neutron numbers |
| element | all its atoms are alike |
| material | element or combination of different atoms |
| symbol for atom | starts with a capital letter |
| A and Z | mass and atomic number |
