In
Indium
Indium is a chemical element with the symbol In and atomic number 49. It has a standard atomic weight of 114.82, sits in period 5 and group 13, and is classified as a post-transition metal.
Properties
| Symbol | In |
|---|---|
| Atomic number | 49 |
| Standard atomic weight | 114.82 |
| Category | Post-transition metal |
| Group | 13 |
| Period | 5 |
| Electron configuration | [Kr] 4d10 5s2 5p1 |
| Outer-shell electrons | 3 |
The figure of 114.82 is a standard atomic weight.
Calculate with indium
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 13
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.