| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | promethium | Western countries | Promethium is a rare earth element used in nuclear batteries and research applications. | 1 |
| 2 | promethium | Western countries | Rarely used outside of scientific research and industrial applications due to its radioactive nature | 1 |
| 3 | promethium | western culture | Rarely encountered and not well known outside of scientific circles | 1 |