| 원자번호 | 전자껍질 | K | L | M | N | 전자 배치 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 기호 | 1s | 2s | 2p | 3s | 3p | 4s | ||||||
| 1 | H | ↑ | 1s1 | |||||||||
| 2 | He | ⇅ | 1s2 | |||||||||
| 3 | Li | ⇅ | ↑ | 1s22s1 | ||||||||
| 4 | Be | ⇅ | ⇅ | 1s22s2 | ||||||||
| 5 | B | ⇅ | ⇅ | ↑ | 1s22s22p1 | |||||||
| 6 | C | ⇅ | ⇅ | ↑ | ↑ | 1s22s22p2 | ||||||
| 7 | N | ⇅ | ⇅ | ↑ | ↑ | ↑ | 1s22s22p3 | |||||
| 8 | O | ⇅ | ⇅ | ⇅ | ↑ | ↑ | 1s22s22p4 | |||||
| 9 | F | ⇅ | ⇅ | ⇅ | ⇅ | ↑ | 1s22s22p5 | |||||
| 10 | Ne | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | 1s22s22p6 | |||||
| 11 | Na | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ↑ | 1s22s22p63s1 | ||||
| 12 | Mg | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | 1s22s22p63s2 | ||||
| 13 | Al | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ↑ | 1s22s22p63s23p1 | |||
| 14 | Si | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ↑ | ↑ | 1s22s22p63s23p2 | ||
| 15 | P | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ↑ | ↑ | ↑ | 1s22s22p63s23p3 | |
| 16 | S | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ↑ | ↑ | 1s22s22p63s23p4 | |
| 17 | Cl | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ↑ | 1s22s22p63s23p5 | |
| 18 | Ar | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | 1s22s22p63s23p6 | |
| 19 | K | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ↑ | 1s22s22p63s23p64s1 |
| 20 | Ca | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | ⇅ | 1s22s22p63s23p64s2 |