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Gallium (Ga)
Atomic number 31 · post
| Atomic number | 31 |
|---|---|
| Atomic mass | 69.723 u |
| Molar mass | 69.723 g/mol |
| Category | post |
| Group / period / block | 13 / 4 / p |
| Electron configuration | [Ar] 3d10 4s2 4p |
| Electrons per shell | 2, 8, 18, 3 |
| Electronegativity (Pauling) | 1.81 |
| Atomic radius | 130.0 pm |
| Density | 5.91 g/cm³ |
| First ionisation energy | 5.9993 eV |
| Melting point | 302.91 K (29.76 °C) |
| Boiling point | 2502.15 K (2229.00 °C) |
| Common oxidation states | +3 |
| Abundance in Earth's crust | 19 ppm |
Uses
LEDs, semiconductors
Discovery
1875, Paul Émile Lecoq de Boisbaudran