86 Rn 222
Radon
NOBLE GAS
Phase: Gas
Discovered: Friedrich Ernst Dorn
Block: P
Summary
Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium. Its most stable isotope, 222Rn, has a half-life of 3.8 days.
Source: WikipediaPhysical Properties
Atomic Mass 222 u
Density 9.73 g/cm³
Melting Point 202 K
Boiling Point 211.5 K