HALOGENS
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Ionic Radius
Units are picometers
| Fluorine, 136 |
| Chlorine, 181 |
| Bromine, 195 |
| Bromine, 216 |
Atomic Radius
Units are in picometers
| Fluorine, 71 |
| Chlorine, 99 |
| Bromine, 114 |
| Iodine, 133 |
Melting Points
Units are degrees Celsius
| Fluorine, -220 |
| Chlorine, -101 |
| Bromine, -1 |
| Iodine, 113 |
Electronegativity
| Fluorine, 4.0 |
| Chlorine, 3.2 |
| Bromine, 3.0 |
| Iodine, 2.7 |
First Ionization Energy
Units are kJ/mol
| Fluorine, 1681 |
| Chlorine, 1251 |
| Bromine, 1140 |
| Iodone, 1008 |
Electron Configuration
| Fluorine | 1s22s22p5 |
| Chlorine | 1s22s22p63s23p5 |
| Bromine | 1s22s22p63s23p64s23d104p5 |
| Iodine | 1s22s22p63s23p64s23d104p65s24d105p5 |