86
Rn
222
Radon (Rn)
Element 86 · Period 6 · Group 18
noble-gas
gas at room temp
p-block
radioactive
About Radon
Radioactive noble gas. Second leading cause of lung cancer. Monitored in homes in radon-prone regions.
Physical Properties
Atomic Mass
222 u
State at 25°C
Gas
Melting Point
-71 °C
Boiling Point
-61.7 °C
Density
0.00973 g/cm³
Magnetism
Diamagnetic
Atomic Properties
Electron Configuration
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶
Electron Shells
2, 8, 18, 32, 18, 8
Atomic Radius
120 pm
Ionization Energy
1037 kJ/mol
Oxidation States
0
Discovery & History
Discovered By
Friedrich Ernst Dorn
Discovery Year
1900
Named By
Friedrich Ernst Dorn
Name origin: Radium (element it decays from)
Frequently Asked Questions
- Is Radon a metal, nonmetal, or metalloid?
- Radon is classified as a noble-gas.
- What state is Radon in at room temperature?
- Radon is a gas at standard room temperature (25°C).
- What is the atomic mass of Radon?
- Radon has an atomic mass of 222 atomic mass units (u).
- Who discovered Radon?
- Radon was discovered by Friedrich Ernst Dorn in 1900.
- Where is Radon on the periodic table?
- Radon is element number 86, located in period 6 and group 18.