Radon (Rn)

From Wikipedia, the free encyclopediaRadon 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.

Radon in the periodic table

SymbolRn
Atomic number86
Group18
Period6
Blockp
Element categoryNoble Gas

Physical properties

Phase at STPGas
Density9.73 g/cm3
Atomic weight222 u
Melting point202 K
-71.15 °C
-96.07 °F
Boiling point211.5 K
-61.65 °C
-78.97 °F

Atomära egenskaper

Electronegativity (Pauling Scale)2.2
Electron affinity-68 kJ/mol
Ionization energies
11037 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6
Electrons per shell2, 8, 18, 32, 18, 8

History

Discovered1899
Discovered byErnest Rutherford
Robert Bowie Owens