Periodic Table/Radon/²⁰⁹Rn

← 208Rn210Rn →

²⁰⁹Rn

Radon-209

Radioactive· Half-life: 28.8 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

86

Neutrons (N)

123

Mass Number (A)

209

Atomic Mass

208.990401AMU

Spin / Parity

5/2-

Binding E/A

7.582keV

Natural Abundance

Trace / None

Half-life

28.8 min

Decay Modesoverview · half-life · α · β⁻ · β⁺

β⁺

83.0%

α

17.0%

Decay Chain

²⁰⁹RnRadon28.8 min

β⁺83.0%

α²⁰⁵Po17.0%

²⁰⁹AtAstatine5.42 h

β⁺96.1%

α²⁰⁵Bi3.90%

²⁰⁹PoPolonium124 y

α99.5%

β⁺²⁰⁹Bi0.45%

²⁰⁵PbLead17.0 My

EC100.0%

²⁰⁵TlThalliumSTABLE

5-step decay chain → stable · Primary path shown · branching ratios indicated

Other Isotopes of Radon

193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231

← Back to RadonData: IAEA NDS · ENSDF