Chlorine

Symbol | Cl
Latin name | Chlorum
Atomic number | 17
Period | 3
Element category | Halogens
Relative atomic mass | 35.4527
Group | VII.A
Electronegativity | 3.0
Oxidation numbers | -1, 1, 3, 4, 5, 6, 7
Electron configuration | 1s2 2s2 2p6 3s2 3p5
Density [g/cm3] | 0.003214
State | Gas
Melting point [°C] | -100.98
Boiling point [°C] | -34.6
Critical point [°C] | 143.75
Critical pressure [MPa] | 7.991
Atomic radius [pm] | 42
Covalent radius [pm] | 71
Thermal conductivity [W m-1K-1] | 0.0089
Heat capacity [J K-1g-1] | 0.48
Discovery | 1774
1.st ionization energy [eV] | 12.9676
2.nd ionization energy [eV] | 23.81
3.rd ionization energy [eV] | 39.611
Stable isotopes | 2
Unstable isotopes | 9