Periodic Table of Elements

Element Chlorine - Cl

Comprehensive data on the chemical element Chlorine is provided on this page; including scores of properties, element names in many languages, most known nuclides of Chlorine. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

Chlorine Menu

Overview of Chlorine

Chlorine's Name in Other Languages

  • Latin: Chlorum
  • Czech: Chlor
  • Croatian: Klor
  • French: Chlore
  • German: Chlor - r
  • Italian: Cloro
  • Norwegian: Klor
  • Portuguese: Clóro
  • Russian: Хлор
  • Spanish: Cloro
  • Swedish: Klor

Atomic Structure of Chlorine

Chemical Properties of Chlorine

Physical Properties of Chlorine

Regulatory / Health

  • CAS Number
    • 7782-50-5
  • UN/NA ID and ERG Guide Number
    • UN1017  / 124 
  • RTECS: F02100000
  • NFPA 704
    • Health:
    • Fire:
    • Reactivity:
    • Special Hazard: OxidizerOSHA Permissible Exposure Limit (PEL)
      • 1 ppm = 2.9mg/m3 @ 25°C & 1 atm
      • Ceiling: 1 ppm
    • OSHA PEL Vacated 1989
    • NIOSH Recommended Exposure Limit (REL)
    • Routes of Exposure: Inhalation; Skin and/or eye contact
    • Target Organs: Eyes, skin, respiratory system
    • Levels In Humans:
      Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
      • Blood/mg dm-3: 2890
      • Bone/p.p.m: 900
      • Liver/p.p.m: 3000-7200
      • Muscle/p.p.m: 2000-5200
      • Daily Dietary Intake: 3 - 6.5 g
      • Total Mass In Avg. 70kg human: 95 g

    Who / Where / When / How

    • Discoverer: Carl Wilhelm Scheele
    • Discovery Location: Uppsala Sweden
    • Discovery Year: 1774
    • Name Origin:
      Greek: khlôros (green).
    • Abundance of Chlorine:
      • Earth's Crust/p.p.m.: 130
      • Seawater/p.p.m.: 18000
      • Atmosphere/p.p.m.: N/A
      • Sun (Relative to H=1E12): 320000
    • Sources of Chlorine:
      Never found in free form in nature. Salt (sodium chloride, NaCl) is its most common compound. World wide production is around 168,000,000 tons per year. There are vast mining deposits in USA, Poland, Russia, Germany, China, India and Australia.
    • Uses of Chlorine:
      Used in water purification, bleaches and in other compounds such as chloro fluorocarbons (CFC).
    • Additional Notes:
      WARNING: Chlorine gas is extremely dangerous and Chlorine should NEVER be mixed with ammonia.

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    A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

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