Gallium (Ga)
Gallium (Ga) is element 31 of the periodic table, a post-transition metal in period 4 and group 13. Its standard atomic weight is 69.723, so one mole of gallium atoms has a mass of 69.723 g. At room temperature it is a solid; it melts at 29.76 °C and boils at 2203.85 °C.
| Atomic number | 31 |
|---|---|
| Symbol | Ga |
| Standard atomic weight | 69.723 |
| Molar mass | 69.723 g/mol |
| Category | Post-transition metal |
| Group | 13 |
| Period | 4 |
| Block | p-block |
| Electron configuration | [Ar] 4s2 3d10 4p1 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.81 |
| Atomic radius (van der Waals) | 187 pm |
| First ionisation energy | 5.999 eV (578.8 kJ/mol) |
| Electron affinity | 0.3 eV |
| State at room temperature | Solid |
| Melting point | 302.91 K (29.76 °C) |
| Boiling point | 2477 K (2203.85 °C) |
| Density | 5.91 g/cm³ |
| Discovered | 1875 |
Group 13
Calculate with Gallium
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.