49 In 114.82
Indium
Post-Transition Metal
Indium (In) is a chemical element with atomic number 49, classified as a post-transition metal. At room temperature it is a solid. It was discovered in 1863 by Ferdinand Reich, Hieronymous Richter.
Properties
- Atomic number
- 49
- Atomic mass
- 114.82 u
- Category
- Post-Transition Metal
- Group
- 13
- Period
- 5
- Block
- p-block
- Electron configuration
- [Kr] 4d¹⁰ 5s² 5p¹
- Phase at STP
- Solid
- Density
- 7.31 g/cm³
- Melting point
- 429.75 K (156.6 °C)
- Boiling point
- 2345 K (2071.8 °C)
- Electronegativity
- 1.78
- Atomic radius
- 156 pm
- Ionization energy
- 5.786 eV
- Discovery
- 1863 · Ferdinand Reich, Hieronymous Richter
Common uses
Touchscreens, LCD displays, semiconductors, solders
Did you know?
Essential for touchscreen technology and extremely soft metal.