Periodic Table/Actinium/²²²Ac

← 221Ac223Ac →

²²²Ac

Actinium-222

Radioactive· Half-life: 5.00 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

89

Neutrons (N)

133

Mass Number (A)

222

Atomic Mass

222.017844AMU

Spin / Parity

1-

Binding E/A

7.478keV

Natural Abundance

Trace / None

Half-life

5.00 s

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

α

99.0%

β⁺

1.0%

Decay Chain

²²²AcActinium5.00 s

α99.0%

β⁺²²²Ra1.00%

²¹⁸FrFrancium1.40 ms

α100.0%

²¹⁴AtAstatine558 ns

α100.0%

²¹⁰BiBismuth5.01 d

β⁻100.0%

α²⁰⁶Tl13.2%

²¹⁰PoPolonium138 d

α100.0%

²⁰⁶PbLeadSTABLE

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