| Nihongo | jpn-001 |
| radon | |
| Classical Arabic—ASJP | arb-001 | rādun |
| bălgarski ezik | bul-001 | radon |
| català | cat-000 | radó |
| čeština | ces-000 | radon |
| Hànyǔ | cmn-003 | dōng |
| dansk | dan-000 | radon |
| Deutsch | deu-000 | Radon |
| eesti | ekk-000 | radoon |
| Ellinika | ell-003 | radonio |
| English | eng-000 | radon |
| Esperanto | epo-000 | radono |
| suomi | fin-000 | radon |
| français | fra-000 | radon |
| ISO 259-3 | heb-001 | radon |
| magyar | hun-000 | radon |
| hyw-001 | radon | |
| íslenska | isl-000 | radon |
| italiano | ita-000 | radon |
| Kartuli | kat-001 | radoni |
| Hangungmal | kor-001 | radon |
| lietuvių | lit-000 | radonas |
| latviešu | lvs-000 | radons |
| Nederlands | nld-000 | radon |
| bokmål | nob-000 | radon |
| Isfahani | pes-001 | râdon |
| polski | pol-000 | radon |
| português | por-000 | radão |
| português | por-000 | radónio |
| português | por-000 | radônio |
| português | por-000 | rádon |
| russkij | rus-001 | radon |
| slovenčina | slk-000 | radón |
| slovenščina | slv-000 | radon |
| español | spa-000 | radón |
| srpski | srp-001 | radon |
| svenska | swe-000 | radon |
| phasa thai | tha-001 | rēdon |
| Türkçe | tur-000 | radon |
| Latynytsia | ukr-001 | radon |