出典:Wiktionary
出典:『Wiktionary』 (2026/04/24 22:53 UTC 版)
| Chemical element |
|---|
| H Atomic number 1 hydrogenium |
| Alternative names: hydrogenum |
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| Next: helium (He) → |
Second-declension noun (neuter).
| singular | plural | |
|---|---|---|
| nominative | hydrogenium | hydrogenia |
| genitive | hydrogeniī | hydrogeniōrum |
| dative | hydrogeniō | hydrogeniīs |
| accusative | hydrogenium | hydrogenia |
| ablative | hydrogeniō | hydrogeniīs |
| vocative | hydrogenium | hydrogenia |