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