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|
Indium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| In | 49 | 114.818 | 156.60 °C | 2072 °C | Solid | 7.31 g/cm3 | Metal |
|
|
|
| General |
| Name, Symbol, Number |
indium, In, 49 |
| Chemical series |
poor metals |
| Group, Period, Block |
13, 5, p |
| Appearance |
silvery lustrous gray
 |
| Standard atomic weight |
114.818(3) g·mol−1 |
| Electron configuration |
[Kr] 4d10 5s2 5p1 |
| Electrons per shell |
2, 8, 18, 18, 3 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
7.31 g·cm−3 |
| Liquid density at m.p. |
7.02 g·cm−3 |
| Melting point |
429.75 K
(156.60 °C, 313.88 °F) |
| Boiling point |
2345 K
(2072 °C, 3762 °F) |
| Heat of fusion |
3.281 kJ·mol−1 |
| Heat of vaporization |
231.8 kJ·mol−1 |
| Heat capacity |
(25 °C) 26.74 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
1196 |
1325 |
1485 |
1690 |
1962 |
2340 |
|
| Atomic properties |
| Crystal structure |
tetragonal |
| Oxidation states |
3
(amphoteric oxide) |
| Electronegativity |
1.78 (scale Pauling) |
Ionization energies
(more) |
1st: 558.3 kJ·mol−1 |
| 2nd: 1820.7 kJ·mol−1 |
| 3rd: 2704 kJ·mol−1 |
| Atomic radius |
155 pm |
| Atomic radius (calc.) |
156 pm |
| Covalent radius |
144 pm |
| Van der Waals radius |
193 pm |
| Miscellaneous |
| Magnetic ordering |
no data |
| Electrical resistivity |
(20 °C) 83.7 n Ω·m |
| Thermal conductivity |
(300 K) 81.8 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 32.1 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 1215 m/s |
| Young's modulus |
11 GPa |
| Mohs hardness |
1.2 |
| Brinell hardness |
8.83 MPa |
| CAS registry number |
7440-74-6 |
| Selected isotopes |
|
|
| References |
|
Indium Compounds
Indium antimonide
Indium arsenide
Indium nitride
Indium phosphide
|
Source: Wikipedia article Indium
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Chemistry Quick Facts
