| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | atomo | atomoj |
| Accusative | atomon | atomojn |
| Albanian | atom |
|---|---|
| Catalan | àtom |
| Danish | atom |
| Dutch | atoom |
| English | atom |
| French | atome |
| German | Atom; Elementarteilchen |
| Greek | άτομο |
| Hawaiian | ʻākoma |
| Hungarian | atom |
| Italian | atomo |
| Latin | atomus |
| Luxemburgish | Atom |
| Papiamento | atom |
| Portuguese | átomo |
| Russian | атом |
| Saterland Frisian | Atom |
| Spanish | átomo |
| Swahili | atomi; atomu |
| Swedish | atom |
| Thai | อะตอม |
| Turkish | atom |
| Welsh | atom |
| West Frisian | atoom |
| Yiddish | אַטאָמ |