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Information valid for Rn-222 unless otherwise noted

Basic Information

Symbol: Rn
Atomic Number: 86
Mass: (222.0)
Melting Point: -71.0 C
Boiling Point: -61.8 C
Number of Protons/Electrons: 86
Number of Neutrons: 136
Classification: Noble Gas
Crystal Structure: Cubic
Density @ 293 K: 9.73 g/cm3
Color: colorless

Atomic Structure

[Bohr Model of Radon]
Number of Energy Levels: 6

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 18
    Sixth Energy Level: 8


Isotope Half Life
Rn-211 14.6 hours
Rn-212 24.0 minutes
Rn-217 0.6 milliseconds
Rn-218 35.0 milliseconds
Rn-219 3.96 seconds
Rn-220 55.61 seconds
Rn-222 3.82 days


Date of Discovery: 1898
Discoverer: Fredrich Ernst Dorn
Name Origin: From radium
Uses: treatment of cancer
Obtained From: decay of radium

Related Links

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  1. Radon Information