49Solid
In 114.818 Atomic mass · uPost-transition metals
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.
Discovery 1863 (Ferdinand Reich)
K2L8M18N18O3
Physical properties
Values for the element in its standard state.
- Density
- 7.31g/cm³
- Melting point
- 430K
- Boiling point
- 2,345K
- Atomic radius
- 144pm
- Bonding type
- Metallic
- Molar heat
- 26.74J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 1 electrons;
[Kr] represents 36 core electrons. The full view shows them explicitly.
49 electrons Orbital order preserved from source
- Electronegativity
- 1.78Pauling scale
- First ionization energy
- 558kJ/mol
- Electron affinity
- 29kJ/mol
- Van der Waals radius
- 193pm
In IndiumAtomic number 49
558kJ/mol
Atomic numberGaps indicate unavailable data
About indium
- Appearance
- Silvery lustrous gray
- Discovery
- 1863 (Ferdinand Reich)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.