Information valid for Rn-222 unless otherwise noted

Radon

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

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

Facts

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

From the US Geologic Survey