Indium (In)
Indium
Indium (In) is a post-transition metal in period 5, group 13. Its relative atomic mass is 114.82 and the molar mass of the atom is 114.82 g/mol.
Atomic number 49
Atomic mass 114.82
Molar mass 114.82 g/mol
Category Post-transition metal Solid
Properties of indium
| Atomic number | 49 |
|---|---|
| Symbol | In |
| Latin name | Indium |
| Relative atomic mass | 114.82 |
| Molar mass | 114.82 g/mol |
| Group, period, block | 13, 5, p |
| Category | Post-transition metal |
| State at 20 °C | Solid |
| Electron configuration | [Kr] 4d¹⁰ 5s² 5p¹ |
| Electronegativity (Pauling) | 1.78 |
| Atomic radius | 155 pm |
Electron configuration of indium
Electrons per shell
K2L8M18N18O3
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p¹
Noble-gas notation
49 protons · 49 electrons[Kr] 4d¹⁰ 5s² 5p¹
Formula and compounds of indium
Simple substanceInindiumMolar mass of In: 114.82 g/mol
Chemistry not clicking? Try a lesson with a tutor
1-to-1 online chemistry lessons for KS3, GCSE and A-level. Your first lesson is a free trial.
Frequently asked questions
The relative atomic mass of indium is 114.82, so the molar mass of the atom is 114.82 g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p¹. Noble-gas notation: [Kr] 4d¹⁰ 5s² 5p¹.