Cl
Chlorine
Element 17 · Halogen · Period 3, Group 17
Gas · Discovered 1774
Atomic Properties
| Atomic Number | 17 |
| Atomic Mass | 35.45u |
| Electron Configuration | [Ne]3s2 3p5 |
| Electronegativity | 3.16Pauling |
| Atomic Radius | 175pm |
| Ionization Energy | 12.968eV |
| Electron Affinity | 3.617eV |
| Oxidation States | +7, +5, +1, -1 |
Physical Properties
| Standard State | Gas |
| Melting Point | 171.65K |
| Boiling Point | 239.11K |
| Density | 0.003214g/cm³ |
| Group Block | Halogen |
| Year Discovered | 1774 |