Indium (In) — Element 49: Properties & Data | Aladdin Scientific
Indium(In) — Element 49
Indium (In) is a post-transition metal with atomic number 49 and atomic mass 114.818. It has melting point 429.75 K (157 °C), boiling point 2345 K (2072 °C), density 7.31 g/cm³. It sits in group 13 and period 5 of the periodic table and was discovered in 1863.
Key facts
| Atomic mass | 114.8180 u |
|---|---|
| Electron configuration | [Kr]5s2 4d10 5p1 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.78 |
| Atomic radius (van der Waals) | 193 pm |
| Ionization energy | 5.786 eV |
| Electron affinity | 0.3 eV |
| Melting point | 429.75 K |
| Boiling point | 2345 K |
| Density | 7.31 g/cm³ |
| Standard state | Solid |
| Year discovered | 1863 |
Frequently asked questions
What is the electron configuration of indium?
The ground-state electron configuration of indium is [Kr]5s2 4d10 5p1.
What group and period is indium in?
Indium (In) is in group 13 and period 5 of the periodic table, classified as a post-transition metal.
What is the melting point of indium?
Indium melts at 429.75 K (157 °C).
What is the standard state of indium?
Indium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .