La période 3 du tableau périodique est la troisième ligne, ou période, du tableau périodique des éléments. Elle contient des éléments du bloc s et du bloc p :
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | ||
| 1 | H | He | |||||||||||||||||
| 2 | Li | Be | B | C | N | O | F | Ne | |||||||||||
| 3 | Na | Mg | Al | Si | P | S | Cl | Ar | |||||||||||
| 4 | K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr | |
| 5 | Rb | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe | |
| 6 | Cs | Ba | * |
Lu | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn |
| 7 | Fr | Ra | * * |
Lr | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og |
| ↓ | |||||||||||||||||||
* |
La | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | |||||
* * |
Ac | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | |||||
| Élément chimique | Famille d'éléments | Configuration électronique[1] | ||
|---|---|---|---|---|
| 11 | Na | Sodium | Métal alcalin | [Ne] 3s1 |
| 12 | Mg | Magnésium | Métal alcalino-terreux | [Ne] 3s2 |
| 13 | Al | Aluminium | Métal pauvre | [Ne] 3s2 3p1 |
| 14 | Si | Silicium | Métalloïde | [Ne] 3s2 3p2 |
| 15 | P | Phosphore | Non-métal | [Ne] 3s2 3p3 |
| 16 | S | Soufre | Non-métal | [Ne] 3s2 3p4 |
| 17 | Cl | Chlore | Halogène | [Ne] 3s2 3p5 |
| 18 | Ar | Argon | Gaz noble | [Ne] 3s2 3p6 |
Notes et références
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