| Iodine | |
| Electrons per shell | 2,8,18,18,7 |
| Electron Configuration | [Kr] 4d10 5s2 5p5 |
| Ground state | 2P°3/2 |
| Atomic Volume | 25.74 cm3 mol-1 |
| Electronegativity | 2.66 |
| Magnetic ordering | Non-magnetic |
| Mass magnetic susceptibility | -4.5 x 10-9 |
| Molar magnetic susceptibility | -5.71 x 10-10 |
 Thermal Properties |
|
| Enthalpy of Atomization | 106.7 kJ mol-1 @25°C |
| Enthalpy of Fusion | 15.27 kJ mol-1 |
| Enthalpy of Vaporisation | 41.67 kJ mol-1 |
| Heat Capacity | (I2) 54.44 J mol-1 K-1 |
| Thermal Conductivity | 0.449 W m-1 K-1 |
| Thermal Expansion | No data. |
| Elastic Properties |
|
| Bulk modulus | 7.7 GPa |
| Electrical Properties |
|
| Electrical resistivity | 1.3 x 107 Ω m |
| Electrical conductivity | 8 x 10-16 106/cm Ω |
| Chemical Properties |
|
| Electrochemical Equivalent | 4.7348 g Ah-1 |
| Valence Electron Potential (-eV) | -6.55 |
| Ionization Potential | |
 First
|
10.451 |
| Second
|
19.131 |
| Third
|
33 |
| Incompatibilities | Ammonia (NH3), acetylene (C2H2), acetaldehyde (C2H4O), powdered aluminium, active metals, liquid chlorine. |
| Flammability |
|
| Non-combustible solid
|
| Energy Levels |
|
| Kα1 (intensity 100) |
28.612 KeV |
| Kα2 (intensity 50) |
28.3172 KeV |
| Kβ1 (intensity 20) |
32.2947 KeV |
| Kβ2 (intensity 5.9) |
33.0365 KeV |
| Kβ3 (intensity 8.7) |
32.2331 KeV |
| Lα1 (intensity 100) |
3.93765 KeV |
| Lα2 (intensity 10) |
3.92604 KeV |
| Lβ1 (intensity 51.9) |
4.22072 KeV |
| Lβ2 (intensity 17) |
4.5075 KeV |
| Lβ3 (intensity 10) |
4.3127 KeV |
| Lβ4 (intensity 4) |
4.2566 KeV |
| Lγ1 (intensity 5.7) |
4.8009 KeV |
| Lγ2 (intensity 3) |
5.0591 KeV |
| Lγ3 (intensity 2) |
3.779 KeV |
| Ll (intensity 4.5) |
3.4855 KeV |
| Atomic Radii |
|
| Empirical
|
140 pm |
| Bohr Radius
|
115 pm |
| Covalent Radius
|
133 pm |
| Van der Waals
|
198 pm |
| Triple covalent
|
125 pm |
| Metallic
|
No data. |
| Oxidation States |
|
| Main
|
I-1 |
| Other
|
I0, I+3, I+5, I+7 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
1008.4 |
| M+ - M2+ |
1845.9 |
| M2+ - M3+ |
3200 |
| M3+ - M4+ |
4100 |
| M4+ - M5+ |
5000 |
| M5+ - M6+ |
7400 |
| M6+ - M7+ |
8700 |
| M7+ - M8+ |
16400 |
| M8+ - M9+ |
19300 |
| M9+ - M10+ |
22100 |
| Covalent Bonds (kJ mol-1) |
|
| I-H
|
299 |
| I-C
|
228 |
| I-O
|
234 |
| I-F
|
280 |
| I-Cl
|
208 |
| I-I
|
151 |
| I-Si
|
234 |
| I-P
|
184 |
| Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 260 | 282 | 309 | 342 | 381 | 457 |
| Crystal Structure |
|
| Structure
|
Orthorhombic |
 |
a = 718.02 pm |
| b = 471.02 pm | |
| c = 981.03 pm | |
| α = 90° | |
| β = 90° | |
| γ = 90° | |