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.
Compounds you can make with indium
Indium appears in one compound in our periodic table sandbox. Each one is a real substance with its true chemical formula — combine the right elements in the right ratio below to discover it.
-
In2O3
Indium(III) Oxide
The base of indium tin oxide (ITO), the invisible conductor coating every touchscreen.