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Argon at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Argon
Symbol: Ar
Atomic Number: 18
Atomic Mass: 39.948 amu
Melting Point: -189.3 °C (83.85 K, -308.74 °F)
Boiling Point: -186.0 °C (87.15 K, -302.8 °F)
Number of Protons/Electrons: 18
Number of Neutrons: 22
Classification: Noble Gas
Crystal Structure: Cubic
Density @ 293 K: 1.784 g/cm3
Color: Colorless Gas

Atomic Structure

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

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 8


Isotope Half Life
Ar-3735.0 days
Ar-39269.0 years
Ar-411.8 hours


Date of Discovery: 1894
Discoverer: Sir William Ramsay
Name Origin: From the Greek word argon (inactive)
Uses: Lighting
Obtained From: air

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MLA Format for Citing This Page

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