Periodic Table/Astatine/²⁰⁸At

← 207At209At →

²⁰⁸At

Astatine-208

Radioactive· Half-life: 1.63 h

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

85

Neutrons (N)

123

Mass Number (A)

208

Atomic Mass

207.986613AMU

Spin / Parity

6+

Binding E/A

7.603keV

Natural Abundance

Trace / None

Half-life

1.63 h

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

β⁺

99.5%

α

0.6%

Decay Chain

²⁰⁸AtAstatine1.63 h

β⁺99.5%

α²⁰⁴Bi0.55%

²⁰⁸PoPolonium2.90 y

α100.0%

β⁺²⁰⁸Bi0.00%

²⁰⁴PbLeadSTABLE

3-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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