49
In
114.82
Indium (In)
Element 49 · Period 5 · Group 13
post-transition
solid at room temp
p-block
About Indium
Soft metal used in touchscreens (ITO), flat-panel displays, and solders.
Physical Properties
Atomic Mass
114.82 u
State at 25°C
Solid
Melting Point
156.6 °C
Boiling Point
2072 °C
Density
7.31 g/cm³
Magnetism
Diamagnetic
Atomic Properties
Electron Configuration
[Kr] 4d¹⁰ 5s² 5p¹
Electron Shells
2, 8, 18, 18, 3
Electronegativity
1.78
Atomic Radius
156 pm
Ionization Energy
558 kJ/mol
Oxidation States
+3
Discovery & History
Discovered By
Ferdinand Reich
Discovery Year
1863
Named By
Ferdinand Reich
Name origin: Latin: indigo (spectral color)
Frequently Asked Questions
- Is Indium a metal, nonmetal, or metalloid?
- Indium is classified as a post-transition.
- What state is Indium in at room temperature?
- Indium is a solid at standard room temperature (25°C).
- What is the atomic mass of Indium?
- Indium has an atomic mass of 114.82 atomic mass units (u).
- Who discovered Indium?
- Indium was discovered by Ferdinand Reich in 1863.
- Where is Indium on the periodic table?
- Indium is element number 49, located in period 5 and group 13.