Periodic Table/Bismuth/²²¹Bi

← 220Bi222Bi →

²²¹Bi

Bismuth-221

Radioactive

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

83

Neutrons (N)

138

Mass Number (A)

221

Atomic Mass

221.025980AMU

Spin / Parity

9/2-

Binding E/A

7.476keV

Natural Abundance

Trace / None

Half-life

Unknown

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

β⁻

β⁻n

Decay Chain

²²¹BiBismuth?

β⁻

β⁻n²²⁰Po

²²¹PoPolonium2.20 min

β⁻100.0%

²²¹AtAstatine2.30 min

β⁻100.0%

²²¹RnRadon25.7 min

β⁻78.0%

α²¹⁷Po22.0%

²²¹FrFrancium4.80 min

α100.0%

¹⁴C²⁰⁷Tl8.80%

β⁻²²¹Ra0.00%

²¹⁷AtAstatine32.6 ms

α100.0%

β⁻²¹⁷Rn0.01%

²¹³BiBismuth45.6 min

β⁻97.9%

α²⁰⁹Tl2.09%

²¹³PoPolonium3.71 μs

α100.0%

²⁰⁹PbLead3.23 h

β⁻100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

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

Other Isotopes of Bismuth

184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224

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