Chlorine at Chemical Elements.com 

 

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

Isotopes

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

Facts


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

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