Tablica Mendelejewa
O K R E S 1 H1Wodór 2 IIA 13 IIIA 14 IVA 15 VA 16 VIA 17 VIIA He2Hel
2 Li3Lit Be4Beryl B5Bor C6Węgiel N7Azot O8Tlen F9Fluor Ne10Neon
3 Na11Sód Mg12Magnez 3 IIIB 4 IVB 5 VB 6 VIB 7 VIIB 8 VIII 9 VIII 10 VIII 11 IB
O K R E S 1 H1Wodór 2 IIA 13 IIIA 14 IVA 15 VA 16 VIA 17 VIIA He2Hel
2 Li3Lit Be4Beryl B5Bor C6Węgiel N7Azot O8Tlen F9Fluor Ne10Neon
3 Na11Sód Mg12Magnez 3 IIIB 4 IVB 5 VB 6 VIB 7 VIIB 8 VIII 9 VIII 10 VIII 11 IB