49 In 114.818
Indium
post-transition metal
Properties
- Atomic number
- 49
- Atomic mass
- 114.818 u
- Category
- post-transition metal
- Group
- 13
- Period
- 5
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 3
- Electronegativity
- 1.78 (Pauling)
- Density
- 7.31 g/cm³
- Melting point
- 156.6 °C
- Boiling point
- 2071.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p¹
Noble-gas shorthand: [Kr] 4d¹⁰ 5s² 5p¹
Electrons per shell: 2, 8, 18, 18, 3, which is 3 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Indium
Indium is a chemical element with symbol In and atomic number 49. It is a post-transition metallic element that is rare in Earth's crust. The metal is very soft, malleable and easily fusible, with a melting point higher than sodium, but lower than lithium or tin.
- Discovered by Ferdinand Reich
- Appearance: silvery lustrous gray
Indium: frequently asked questions
- What is Indium?
- Indium (In) is the chemical element with atomic number 49. It is a metal: specifically a post-transition metal.
- What is the atomic number of Indium?
- Indium's atomic number is 49, which means every Indium atom has 49 protons in its nucleus.
- What is the electron configuration of Indium?
- The electron configuration of Indium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p1 (noble-gas shorthand: [Kr] 4d10 5s2 5p1). Its electrons are arranged in shells of 2, 8, 18, 18, 3, with 3 in the outermost shell.
- Is Indium a metal or a nonmetal?
- Indium is a metal: specifically a post-transition metal.
- What group and period is Indium in?
- Indium is in group 13 and period 5 of the periodic table.
- Is Indium a solid, liquid, or gas?
- At room temperature, Indium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.