E periode in 't periodiek système is e reke van element'n in de tabelle.
D' element'n word'n ingedêeld in periodes ip basis van under elektronconfiguroatie. Iedere periode endigt an de reksche kant met 'n edelgoaze woavan de buut'nste schelle hêelegans gevuld is. In totoal zyn der zeevn periodes:
Andere groeperiengn binn 't periodiek système zyn:
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