Elements / 17
17Cl35.45
Chlorine
Halogen · p-block · ring M · spoke 17
Chlorine is element 17, a halogen. It sits on ring M (period 3) on spoke 17, the halogens. Follow that spoke toward the center and out again to find its chemical relatives.
Properties
| Density | 3.2 g/L (as a gas) | Terrain → |
|---|---|---|
| Melting point | 172 K · -102 °C | Terrain → |
| Boiling point | 239 K · -34 °C | Terrain → |
| Electronegativity | 3.163rd most electronegative of 100 | Terrain → |
| First ionization energy | 1,251 kJ/mol9th highest ionization energy of 103 | Terrain → |
| Atomic weight | 35.45 u | Terrain → |
| Crustal abundance | 145 ppm | Terrain → |
| Discovered | 1774 | Terrain → |
Values from open reference data; see sources. "Terrain" opens that property as a 3D landscape across the whole spiral.
Two things you might not know
- In 1847 Ignaz Semmelweis had Austrian doctors disinfect their hands with water containing it.
- Named from the Greek for pale green; it keeps swimming pools clean and makes up half of table salt.
Checked against en.wikipedia.org.
Spoke 17: Halogens
Ring M (period 3)
Play with Chlorine
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.