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Reference
|
Iodine
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| I | 53 | 126.904 | 113.7 °C | 184.3 °C | Solid | 4.933 g/cm3 | Non-Metal  |
|
|
|
| General |
| Name, Symbol, Number |
iodine, I, 53 |
| Chemical series |
halogens |
| Group, Period, Block |
17, 5, p |
| Appearance |
violet-dark gray, lustrous
 |
| Standard atomic weight |
126.90447(3) g·mol−1 |
| Electron configuration |
[Kr] 4d10 5s2 5p5 |
| Electrons per shell |
2, 8, 18, 18, 7 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
4.933 g·cm−3 |
| Melting point |
386.85 K
(113.7 °C, 236.66 °F) |
| Boiling point |
457.4 K
(184.3 °C, 363.7 °F) |
| Critical point |
819 K, 11.7 MPa |
| Heat of fusion |
(I2) 15.52 kJ·mol−1 |
| Heat of vaporization |
(I2) 41.57 kJ·mol−1 |
| Heat capacity |
(25 °C) (I2) 54.44 J·mol−1·K−1 |
Vapor pressure (rhombic)
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
260 |
282 |
309 |
342 |
381 |
457 |
|
| Atomic properties |
| Crystal structure |
orthorhombic |
| Oxidation states |
±1, 5, 7
(strongly acidic oxide) |
| Electronegativity |
2.66 (scale Pauling) |
| Ionization energies |
1st: 1008.4 kJ/mol |
| 2nd: 1845.9 kJ/mol |
| 3rd: 3180 kJ/mol |
| Atomic radius |
140 pm |
| Atomic radius (calc.) |
115 pm |
| Covalent radius |
133 pm |
| Van der Waals radius |
198 pm |
| Miscellaneous |
| Magnetic ordering |
nonmagnetic |
| Electrical resistivity |
(0 °C) 1.3×107 Ω·m |
| Thermal conductivity |
(300 K) 0.449 W·m−1·K−1 |
| Bulk modulus |
7.7 GPa |
| CAS registry number |
7553-56-2 |
| Selected isotopes |
|
|
| References |
|
Iodine Compounds
|
Source: Wikipedia article Iodine
|
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Chemistry Quick Facts
