ClZ =  17

From the Greek "chloros", meaning "pale green"
(AM) Atomic Mass 35.4527  amu    Oxidation States +1, +3, +5, +7, -1
   (BP) Boiling Point -34.6  °C    (MP) Melting Point -100.9  °C
   (ρ) Density 0.003214  g/cm3    Crystal Structure Orthorhombic
   ( χ ) Electronegativity 3    (AR) Atomic Radius 0.99  Å
   Physical State Gas (C) Heat Capacity 0.479  J/g °C
Electronic-Config [Ne]  3s2  3p5     (I1) First Ionization E 1251.12  kJ/mol
   (ΔHvap) Heat of Vaporization 20.41  kJ/mol     (ΔHfus) Heat of Fusion 6.406  kJ/mol
   Year of Discovery 1774    Location of Discovery Sweden
(E°) Standard Potential Cl2 (g) ⇔ 2 Cl- (1.360 V)
Stable isotopes  35Cl,  37Cl
Discovered/Synthesized by Carl Wilhelm Scheele
Natural Source The mineral/ore halite (rock salt)
Common Uses Bleach, disinfectant, drinking water, swimming pools, PVC plastic pipes and bottles
Other Info One of humanity’s best friends used for disinfection
Exists in nature as the diatomic molecule Cl2
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