← Back to the periodic table
31
Ga
69.723
Gallium
Post-transition metals · Group 13 · Period 4
Atomic properties
| Atomic number | 31 |
|---|---|
| Symbol | Ga |
| Standard atomic weight | 69.723 |
| Classification | Post-transition metals |
| Group | 13 |
| Period | 4 |
| Block | p-block |
| Electron configuration | [Ar] 3d10 4s2 4p1 |
| Electronegativity (Pauling) | 1.81 |
| Common oxidation states | +3 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 5.91 g/cm³ |
| Melting point | 29.76 °C |
| Boiling point | 2400 °C |
| Discovered | 1875 |
| CAS number | — |