#86
Rn
Radon
222 u

Radon

Noble Gas
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Properties

Symbol Rn
Atomic Number 86
Atomic Mass 222
Protons 86
Neutrons 136
Electrons 86
Type Noble Gas
Isotopes Radon-222
Discovery Year 1899
Discovered By Frederick William Dorn
Group 18
Period 6
Boiling Point -61.7°C
Melting Point -71°C
Electron Configuration [Xe] 6s² 4f¹⁴ 5d¹⁰ 6p⁶
Density (g/cm³) 0.222
Crystal Structure Cubic
Magnetism Diamagnetic
Abundance in Earth's Crust Trace
Phase at Room Temperature Gas
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