Chemical – Chlorine (Cl)


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Basic Information

Name: Chlorine

Symbol: Cl

Atomic Number: 17

Atomic Mass: 35.4527 amu

Melting Point: -100.98 °C (172.17 K, -149.764 °F)

Boiling Point: -34.6 °C (238.55 K, -30.279997 °F)

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

    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 khlros (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
    Information about sodium chloride (table salt)
  • Chlorine Chemistry Council
    • Designed to promote understanding of chlorine chemistry

    If you know of any other links for Chlorine, please let me know

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