| Part of speech | common noun |
|---|---|
| Gender | common |
| Singular | Plural | |||
|---|---|---|---|---|
| Indefinite | Definite | Indefinite | Definite | |
| Nominative | atom | atomen | atomer | atomerna |
| Genitive | atoms | atomens | atomers | atomernas |
| Albanian | atom |
|---|---|
| Catalan | àtom |
| Danish | atom |
| Dutch | atoom |
| English | atom |
| Esperanto | atomo |
| French | atome |
| German | Atom |
| 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 |
| Thai | อะตอม |
| Turkish | atom |
| Welsh | atom |
| West Frisian | atoom |
| Yiddish | אַטאָמ |