Atomic number: 17
Density at 25°C: gas
Chlorine is a gas that has a slightly yellowish haze. But it is also very unstable chemically. Even with it self it needs company with itself as Cl2 . As with other reactive elements it tends to be bound up with other elements. In this case sodium is a good example to produce common table salt NaCl.
Use, natural applications or common combinations:
- Essential to life as Cl- ion
- Common acid with as HCl
- Swimming pool cleaning agent ( usually in the form of Trichloroisocyanuric acid with the formula (C3Cl3N3O3) Trichlor for short.
- Standard atomic weight: [35.446, 35.457] why this variation?
- Melting point: -101.5 °C
- Boiling point: -34.04 °C
- Radioactivity: most are stable
- trace amounts of 36Cl with half life of 3.01×105 years