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, which is 3 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
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
Gallium: frequently asked questions
- What is Gallium?
- Gallium (Ga) is the chemical element with atomic number 31. It is a metal: specifically a post-transition metal.
- What is the atomic number of Gallium?
- Gallium's atomic number is 31, which means every Gallium atom has 31 protons in its nucleus.
- What is the electron configuration of Gallium?
- The electron configuration of Gallium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1 (noble-gas shorthand: [Ar] 3d10 4s2 4p1). Its electrons are arranged in shells of 2, 8, 18, 3, with 3 in the outermost shell.
- Is Gallium a metal or a nonmetal?
- Gallium is a metal: specifically a post-transition metal.
- What group and period is Gallium in?
- Gallium is in group 13 and period 4 of the periodic table.
- Is Gallium a solid, liquid, or gas?
- At room temperature, Gallium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.