| element(noun, feature, part, product, component) |
| radioactive decay(expression, science, process, decay, stage) |
| atom(noun, element, product, physics) |
| branch of physics(expression, science, field, physics) |
| chemical science(expression, environment, science, chemistry) |
| daughter(noun, feature, state, characteristic) |
| isotope(noun, element, product, physics) |
| knowledge of nature(expression, science, field, physics) |
| natural philosophy(expression, science, field, physics) |
| natural science(expression, environment, science, field, chemistry) |
| nuclear chemistry(expression, science, field, radioactivity) |
| nuclear decay(expression, science, decay, physics) |
| nuclear physics(expression, science, field, radioactivity) |
| nuclide(noun, element, product, physics) |
| particle(noun, element, product, physics) |
| physical science(expression, science, field, physics) |
| product(noun, element, particle, physics) |
| radioactivity(noun, science, decay, physics) |
| component(noun, feature, part, element) |
| decay chain(expression, process, stage, chain) |