Information valid for Ar-40 unless otherwise noted
Argon
Basic Information
Symbol: Ar
Atomic Number: 18
Mass: 39.948
Melting Point: -189.3
Boiling Point: -186
Number of Protons/Electrons: 18
Number of Neutrons: 22
Classification: Noble Gas
Crystal Structure: Cubic
Density: 1.784
Color: Colorless Gas
Atomic Structure
Number of Energy Levels: 3
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 8
Isotopes
Isotope
Half Life
Ar-36
Stable
Ar-37
35 days
Ar-38
Stable
Ar-39
269 years
Ar-40
Stable
Ar-41
1.8 hours
Facts
Date of Discovery: 1894
Discoverer: Sir William Ramsey
Name Origin: From the Greek word argon (inactive)
Uses: Lighting
Obtained From: air
Related Links
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![[ATOM]](atom.gif)
![[Bohr Model of Argon]](b0018.gif)
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