Information valid for Cl-35 unless otherwise noted
Chlorine
Basic Information
Symbol: Cl
Atomic Number: 17
Mass: 35.4527
Melting Point: -100.98
Boiling Point: -34.6
Number of Protons/Electrons: 17
Number of Neutrons: 18
Classification: Halogen
Crystal Structure: Orthorhombic
Density: 3.214
Color: green
Atomic Structure
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 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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