Perioade 1 is de earste perioade fan it periodyk systeem. Alle eleminten yn perioade 1 hawwe allinne elektroanen yn de 1s-skyl. Dizze skyl kin op syn heechst twa elektroanen hâlde, dêrom hat de earste perioade mar 2 eleminten:
| 1 H |
2 He |
| =Net-metalen | =Edelgassen |
Alle perioaden
- Perioade 1
- Perioade 2
- Perioade 3
- Perioade 4
- Perioade 5
- Perioade 6
- Perioade 7
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