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10203040506070809010011000.511.522.53‌ Å

17 - Chlorine diatomic nonmetal

Atomic Mass (u)

35.45

Density (g/liter)

3.2

Phase

Gas

Year of Discovery

1774
ChlorineClElectron 1Electron 2Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7

Chlorine is a chemical element with symbol Cl and atomic number 17. It also has a relative atomic mass of 35.5. Chlorine is in the halogen group (17) and is the second lightest halogen following fluorine.

17 Atomic Number
35.45  u Atomic Mass
172.31  K Melting Point
239.11  K Boiling Point
3.2  g/liter Density
0.97  Å Atomic Radius
1.02  Å Covalent Radius
3.16 Electronegativity
12.97  eV First Ionization Energy
348.57 Electron Affinity
3 Number of Shells
7 Electron Valency
2, 8, 7 Electron Shell Occupations
0.48  J/g Specific Heat