Periodic Table/Astatine/¹⁹¹At

192At →

¹⁹¹At

Astatine-191

Radioactive· Half-life: 2.10 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

85

Neutrons (N)

106

Mass Number (A)

191

Atomic Mass

191.004148AMU

Spin / Parity

1/2+

Binding E/A

7.476keV

Natural Abundance

Trace / None

Half-life

2.10 ms

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

α

100.0%

β⁺

Decay Chain

¹⁹¹AtAstatine2.10 ms

α100.0%

β⁺¹⁹¹Po

¹⁸⁷BiBismuth37.0 ms

α100.0%

¹⁸³TlThallium6.90 s

β⁺

α¹⁷⁹Au

¹⁸³HgMercury9.40 s

β⁺88.3%

α¹⁷⁹Pt11.7%

β⁺p¹⁸²Pt2.60%

¹⁸³AuGold42.8 s

β⁺99.5%

α¹⁷⁹Ir0.55%

¹⁸³PtPlatinum6.50 min

β⁺100.0%

α¹⁷⁹Os0.01%

¹⁸³IrIridium58.0 min

β⁺100.0%

α¹⁷⁹Re

¹⁸³OsOsmium13.0 h

β⁺100.0%

¹⁸³ReRhenium70.0 d

EC100.0%

¹⁸³WTungstenSTABLE

10-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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