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 — that's 3 in the outermost shell.
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
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.