Element Indium
It is a chemical element with the symbol In and atomic number 49.
Indium is the softest metal that is not an alkali metal. It is a silvery-white metal that resembles tin in appearance. Element Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust.
Indium has a melting point higher than sodium and gallium, but lower than lithium and tin.
Names and Identifiers
| Chemical Formula: | In |
| CAS: | 7440-74-6 |
| Molecular Weight: | 114.81800 g/mol |
| EC Number : | 231-180-0 |
| MDL Number: | MFCD00134048 |
| Color: | silvery lustrous gray/ silvery-white |
| Other Names: | n/a |
| PubChem CID: | 5359967 |
| IUPAC Name: | Indium |
| Inchl: | InChI=1S/In |
| InChI Key: | APFVFJFRJDLVQX-UHFFFAOYSA-N |
| Canonical SMILES: | [In] |
| ICSC Number: | 1293 |
Physical & Chemical Properties
| Phase: | Solid |
| Density: | 7.31 g/cm³ |
| Boiling Point: | 2345 K (2072 °C, 3762 °F) |
| Melting Point: | 429.7485 K (156.5985 °C, 313.8773 °F) |
| Molecular Formula: | In |
| Flash Point: | 2072°C |
| Exact Mass: | 114.90400 |
| Symbol: |  |
| Signal Word: | Warning |
| Hazard Statements: | H302 + H312 + H332-H315-H319-H335 |
| Precautionary Statements: | P261-P280-P305 + P351 + P338 |
| Hazard Codes: | Xn:Harmful |
| Risk Phrases: | R20/21/22;R36/37/38 |
| Safety Phrases: | S9-S16-S36/37/39-S36-S26-S45-S28 |
| RIDADR: | UN 3089 4.1/PG 2 |
| WGK Germany: | 3 |
| RTECS: | NL1050000 |
| Packaging Group: | III |
| Hazard Class: | 8 |
Indium has 39 known isotopes, ranging in mass number from 97 to 135. Only two isotopes occur naturally as primordial nuclides.
Naturally occurring isotopes
| Isotope | Mass/Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| 113In | 112.904061 (4) | 4.29 (5) | 9/2 | 5.5289 |
| 115In | 114.903882 (4) | 95.71 (5) | 9/2 | 5.5408 |
Radiosotope data
| Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 109In | 108.90715 | 4.2 h | EC to 109Cd | 9/2 | 5.54 |
| 110In | 109.90717 | 1.15 h | EC to 110Cd | 2 | 4.37 |
| 111In | 110.90511 | 2.8049 d | EC to 111Cd | 9/2 | 5.50 |
| 112In | 111.90553 | 14.4 m | EC to 112Cd; β– to 112Sn | 1 | 2.82 |
| 114In | 114.904918 | 1.198 m | EC to 114Cd; β– to 114Sn | 1 | 2.82 |
| 115In | 116.903879 | 4.4 x 1014 y | β– to 115Sn | 9/2 | 5.541 |