Radon at Chemical Elements.com 


 

Basic Information


Name: Radon
Symbol: Rn
Atomic Number: 86
Atomic Mass: (222.0) amu
Melting Point: -71.0 °C (202.15 °K, -95.8 °F)
Boiling Point: -61.8 °C (211.35 °K, -79.24 °F)
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

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

Isotopes

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

Facts


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