Periodic Table/Astatine/²⁰⁵At

← 204At206At →

²⁰⁵At

Astatine-205

Radioactive· Half-life: 26.9 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

85

Neutrons (N)

120

Mass Number (A)

205

Atomic Mass

204.986061AMU

Spin / Parity

9/2-

Binding E/A

7.598keV

Natural Abundance

Trace / None

Half-life

26.9 min

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

β⁺

90.0%

α

10.0%

Decay Chain

²⁰⁵AtAstatine26.9 min

β⁺90.0%

α²⁰¹Bi10.0%

²⁰⁵PoPolonium1.74 h

β⁺100.0%

α²⁰¹Pb0.04%

²⁰⁵BiBismuth14.9 d

β⁺100.0%

²⁰⁵PbLead17.0 My

EC100.0%

²⁰⁵TlThalliumSTABLE

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

Other Isotopes of Astatine

191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229

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