Uun't 2. periode faan't periodensüsteem san cheemisk elementen, diar tau elektroonenskelen haa. Det iarst as fol besaat. Det ööder koon tesken ian an aacht elektroonen haa. Det taal faan elektroonen uun't bütjenst elektroonenskel bestemet det walens (wäärdaghaid), an sodenang uk a eegenskapen faan det element.
 Tekst üüb Öömrang |
| Skööl | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Hoodskööl | I | II | III | IV | V | VI | VII | VIII | ||||||||||
| Atoomnumer Sümbool |
3 Li |
4 Be |
5 B |
6 C |
7 N |
8 O |
9 F |
10 Ne | ||||||||||
| Alkaalimetalen | Eerdalkaalimetalen | Hualewmetalen | Nianmetalen | Halogeenen | Eedelgaasen |
| Elektroonenskel | Taal faan elektroonen | Beskriiwang | ||||
|---|---|---|---|---|---|---|
| Tuup | s-Orbital | p-Orbital | d-Orbital | f-Orbital | ||
| 1 | 2 | 2 | - | - | - | Banenst/iarst elektroonenskel |
| 2 | 1 bit 8 | 1 bit 2 | 0 bit 6 | - | - | Bütjenst/ööder elektroonenskel (Walensskel) |
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