Periodic Table/Protactinium/²²¹Pa

← 220Pa222Pa →

²²¹Pa

Protactinium-221

Radioactive· Half-life: 5.90 μs

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

91

Neutrons (N)

130

Mass Number (A)

221

Atomic Mass

221.021873AMU

Spin / Parity

9/2-

Binding E/A

7.447keV

Natural Abundance

Trace / None

Half-life

5.90 μs

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

α

100.0%

Decay Chain

²²¹PaProtactinium5.90 μs

α100.0%

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

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

Other Isotopes of Protactinium

211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241

← Back to ProtactiniumData: IAEA NDS · ENSDF