Periodic Table/Thorium/²¹⁷Th

← 216Th218Th →

²¹⁷Th

Thorium-217

Radioactive· Half-life: 248 μs

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

90

Neutrons (N)

127

Mass Number (A)

217

Atomic Mass

217.013103AMU

Spin / Parity

9/2+

Binding E/A

7.479keV

Natural Abundance

Trace / None

Half-life

248 μs

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

α

100.0%

Decay Chain

²¹⁷ThThorium248 μs

α100.0%

²¹³RaRadium2.73 min

α87.0%

β⁺²¹³Fr13.0%

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

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

Other Isotopes of Thorium

208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239

← Back to ThoriumData: IAEA NDS · ENSDF