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Information valid for Cl-35 unless otherwise noted

Basic Information

Symbol: Cl
Atomic Number: 17
Mass: 35.4527
Melting Point: -100.98 C
Boiling Point: -34.6 C
Number of Protons/Electrons: 17
Number of Neutrons: 18
Classification: Halogen
Crystal Structure: Orthorhombic
Density @ 293 K: 3.214 g/cm3
Color: green

Atomic Structure

[Bohr Model of Chlorine]
Number of Energy Levels: 3

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 7


Isotope Half Life
Cl-35 Stable
Cl-36 301000.0 years
Cl-37 Stable
Cl-38 37.2 minutes


Date of Discovery: 1774
Discoverer: Carl Wilhelm Scheele
Name Origin: From the Greek word khl˘ros (green)
Uses: Water purification, bleaches
Obtained From: Salt

Related Links

Note: The external links below are not a part of this site and their content is not the responsibility of this site

  1. Salt Institute
  2. Chlorine Chemistry Council
  3. HHMI Laboratory Safety: Chlorine