| A | B |
|---|
| nuclear radiation | high-energy particles and rays that are emitted by the nuclei of some atoms |
| radioactivity | the ability of some elements to give off nuclear radiation |
| radioactive decay | the process in which the nucleus of a radioactive atom releases nuclear radiation |
| alpha decay | the release of an alpha particle from a nucleus |
| mass number | the sum of protons and neutrons in an atom |
| beta decay | the release of a beta particle from a nucleus |
| isotopes | atoms that have the same number of protons but have different numbers of neutrons |
| gamma decay | the release of gamma rays from a nucleus |
| half-life | the amount of time it takes for one-half the nuclei of radioactive isotope to decay |
| nuclear fission | the process in which a large nucleus splits into two smaller nuclei |
| nuclear chain reaction | a continuous series of nuclear fission reactinos |
| nuclear fusion | the process in which two or more nuclei with small masses join together, or fuse, to form a larger, more massive nucleus |
