| Quality | Flourine | Chlorine | Bromine | Iodine |
| Standard State | Gas | Gas | Liquid | Solid |
| Melting Point(oC) | -219.47 | -100.83 | -7.2 | 113.7 |
| Boiling Point(oC) | -187.99 | -33.82 | 58.78 | 184.5 |
| First I.E.(Kj/mol.) | 1682 | 1251 | 1139 | 1008 |
| Reactivity | Most | Second most | Second least | Least |
| Diatomic bond strength | 155 | 240 | 190 | 149 |
| Size | Smallest | Second smallest | Second biggest | Biggest |