Periodic Table/Actinium/²⁰⁹Ac

← 208Ac210Ac →

²⁰⁹Ac

Actinium-209

Radioactive· Half-life: 94.0 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

89

Neutrons (N)

120

Mass Number (A)

209

Atomic Mass

209.009495AMU

Spin / Parity

9/2-

Binding E/A

7.478keV

Natural Abundance

Trace / None

Half-life

94.0 ms

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

α

100.0%

β⁺

Decay Chain

²⁰⁹AcActinium94.0 ms

α100.0%

β⁺²⁰⁹Ra

²⁰⁵FrFrancium3.90 s

α98.5%

β⁺²⁰⁵Rn1.50%

²⁰¹AtAstatine1.42 min

α71.0%

β⁺²⁰¹Po29.0%

¹⁹⁷BiBismuth9.33 min

β⁺100.0%

α¹⁹³Tl

¹⁹⁷PbLead8.10 min

β⁺100.0%

¹⁹⁷TlThallium2.84 h

β⁺100.0%

¹⁹⁷HgMercury2.71 d

EC100.0%

¹⁹⁷AuGoldSTABLE

8-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