| Part of speech | unknown part of speech |
|---|
| Nominative | protono |
|---|---|
| Accusative | protonon |
| Afrikaans | proton |
|---|---|
| Albanian | proton |
| Dutch | proton |
| English | proton |
| French | proton |
| German | Proton |
| Greek | πρωτόνιο |
| Luxemburgish | Proton |
| Portuguese | próton |
| Romanian | proton |
| Spanish | protón |
| Swahili | protoni |
| Swedish | proton |
| Thai | โปรตอน |
| Turkish | proton |
| Welsh | proton |
| West Frisian | proton |