Periodic Table/Actinium/²²¹Ac

← 220Ac222Ac →

²²¹Ac

Actinium-221

Radioactive· Half-life: 52.0 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

89

Neutrons (N)

132

Mass Number (A)

221

Atomic Mass

221.015600AMU

Spin / Parity

9/2-

Binding E/A

7.485keV

Natural Abundance

Trace / None

Half-life

52.0 ms

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

α

100.0%

Decay Chain

²²¹AcActinium52.0 ms

α100.0%

²¹⁷FrFrancium22.0 μs

α100.0%

²¹³AtAstatine125 ns

α100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

5-step decay chain → stable · Primary path shown

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