Periodic Table/Actinium/²¹⁷Ac

← 216Ac218Ac →

²¹⁷Ac

Actinium-217

Radioactive· Half-life: 69.0 ns

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

89

Neutrons (N)

128

Mass Number (A)

217

Atomic Mass

217.009342AMU

Spin / Parity

9/2-

Binding E/A

7.501keV

Natural Abundance

Trace / None

Half-life

69.0 ns

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

α

100.0%

β⁺

Decay Chain

²¹⁷AcActinium69.0 ns

α100.0%

β⁺²¹⁷Ra

²¹³FrFrancium34.1 s

α99.4%

β⁺²¹³Rn0.56%

²⁰⁹AtAstatine5.42 h

β⁺96.1%

α²⁰⁵Bi3.90%

²⁰⁹PoPolonium124 y

α99.5%

β⁺²⁰⁹Bi0.45%

²⁰⁵PbLead17.0 My

EC100.0%

²⁰⁵TlThalliumSTABLE

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

Other Isotopes of Actinium

205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237

← Back to ActiniumData: IAEA NDS · ENSDF