Indium (In)
Indium (In) is element 49 of the periodic table, a post-transition metal in period 5 and group 13. Its standard atomic weight is 114.818, so one mole of indium atoms has a mass of 114.818 g. At room temperature it is a solid; it melts at 156.6 °C and boils at 2071.85 °C.
| Atomic number | 49 |
|---|---|
| Symbol | In |
| Standard atomic weight | 114.818 |
| Molar mass | 114.818 g/mol |
| Category | Post-transition metal |
| Group | 13 |
| Period | 5 |
| Block | p-block |
| Electron configuration | [Kr] 5s2 4d10 5p1 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.78 |
| Atomic radius (van der Waals) | 193 pm |
| First ionisation energy | 5.786 eV (558.3 kJ/mol) |
| Electron affinity | 0.3 eV |
| State at room temperature | Solid |
| Melting point | 429.75 K (156.6 °C) |
| Boiling point | 2345 K (2071.85 °C) |
| Density | 7.31 g/cm³ |
| Discovered | 1863 |
Group 13
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Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.