Periodic Table/Uranium/²²¹U

← 220U222U →

²²¹U

Uranium-221

Radioactive· Half-life: 660 ns

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

92

Neutrons (N)

129

Mass Number (A)

221

Atomic Mass

221.026323AMU

Spin / Parity

9/2+

Binding E/A

7.422keV

Natural Abundance

Trace / None

Half-life

660 ns

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

α

100.0%

β⁺

Decay Chain

²²¹UUranium660 ns

α100.0%

β⁺²²¹Pa

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

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

Other Isotopes of Uranium

215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243

← Back to UraniumData: IAEA NDS · ENSDF