Periodic Table/Astatine/²⁰³At

← 202At204At →

²⁰³At

Astatine-203

Radioactive· Half-life: 7.40 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

85

Neutrons (N)

118

Mass Number (A)

203

Atomic Mass

202.986943AMU

Spin / Parity

9/2-

Binding E/A

7.590keV

Natural Abundance

Trace / None

Half-life

7.40 min

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

β⁺

69.0%

α

31.0%

Decay Chain

²⁰³AtAstatine7.40 min

β⁺69.0%

α¹⁹⁹Bi31.0%

²⁰³PoPolonium36.7 min

β⁺99.9%

α¹⁹⁹Pb0.11%

²⁰³BiBismuth11.8 h

β⁺100.0%

²⁰³PbLead2.16 d

EC100.0%

²⁰³TlThalliumSTABLE

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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