Unit 3 Vocabulary
| element |
| proton |
| neutron |
| electron |
| quark |
| nucleus |
| antimatter |
| positron |
| gamma ray |
| atomic number |
| atomic mass |
| isotope |
| ion |
| alpha decay |
| beta decay |
| positron emission |
| half life |
| fission |
| fusion |
| critical mass |
| subcritical mass |
| supercritical mass |
| valence electron |
| ionization energy |
| metals |
| non-metals |
| halogens |
| alkali metals |
| alkaline earth metals |
| transition elements |
| inner transition elements |
| noble gases |