| Part of speech | unknown part of speech |
|---|
| Nominative | radiumo |
|---|---|
| Accusative | radiumon |
| Catalan | radi |
|---|---|
| Dutch | radium |
| English | radium |
| French | radium |
| German | Radium |
| Greek | ράδιο |
| Icelandic | radín; radíum |
| Portuguese | rádio |
| Saterland Frisian | Radium |
| Spanish | radium; radio |
| Sranan | radimi |
| Turkish | radyum |