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86Rn222.000
Radon
Noble GasRadon 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.
Phase: GasAppearance: colorless gas, occasionally glows green or red in discharge tubes
2, 8, 18, 32, 18, 8
Physical Properties
Atomic Mass222 u
Density9.73 g/cm³
Melting Point202 K
Boiling Point211.5 K
Period6
PhaseGas
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6
Semantic Config[Xe] 4f14 5d10 6s2 6p6
Shells2, 8, 18, 32, 18, 8
Electron Affinity-68 kJ/mol
Electronegativity2.2
Ionization Energies
IE1: 1037 kJ/mol
Discovery
Discovered byFriedrich Ernst Dorn