31 Ga 69.723
Gallium
post-transition metal
Properties
- Atomic number
- 31
- Atomic mass
- 69.723 u
- Category
- post-transition metal
- Group
- 13
- Period
- 4
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 3
- Electronegativity
- 1.81 (Pauling)
- Density
- 5.91 g/cm³
- Melting point
- 29.76 °C
- Boiling point
- 2399.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹
Noble-gas shorthand: [Ar] 3d¹⁰ 4s² 4p¹
Electrons per shell: 2, 8, 18, 3 — that's 3 in the outermost shell.
About Gallium
Gallium is a chemical element with symbol Ga and atomic number 31. Elemental gallium does not occur in free form in nature, but as the gallium(III) compounds that are in trace amounts in zinc ores and in bauxite. Gallium is a soft, silvery metal, and elemental gallium is a brittle solid at low temperatures, and melts at 29.76 °C (85.57 °F) (slightly above room temperature).
- Discovered by Lecoq de Boisbaudran
- Appearance: silver-white
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.