| Element | Iodine | Symbol | I |
| Atomic Number | 53 | Molar Mass | 126.9gmol-1 |
| Electron Configuration | [Kr]4d105s25p5 | Normal State | solid nonmetal |
| Density @STP | 4.95 g cm-3 | Melting Point | 114oC |
| Boiling Point | 184oC | Stable Isotopes | 127I |
| Atomic Radius | 133 pm | Ionic Radius | 220 (1-) pm |
| Electronegativity (Pauling) | 2.66 | Ionization Energy (1st) | 1008 kJ mol-1 |
| Ionization Energy (2nd) | 1846 kJ mol-1 | Ionization Energy (3rd) | 3200 kJ mol-1 |
| Molar Heat Capacity | 20.8 J K-1mol-1 | Standard Molar Entropy | 180.8 J K-1mol-1 |
| Enthalpy of Fusion | 15.27 kJ mol-1 | Enthalpy of Vapourization | 41.67 kJ mol-1 |