Periodic Table/Astatine/²⁰¹At

← 200At202At →

²⁰¹At

Astatine-201

Radioactive· Half-life: 1.42 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

85

Neutrons (N)

116

Mass Number (A)

201

Atomic Mass

200.988417AMU

Spin / Parity

9/2-

Binding E/A

7.578keV

Natural Abundance

Trace / None

Half-life

1.42 min

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

α

71.0%

β⁺

29.0%

Decay Chain

²⁰¹AtAstatine1.42 min

α71.0%

β⁺²⁰¹Po29.0%

¹⁹⁷BiBismuth9.33 min

β⁺100.0%

α¹⁹³Tl

¹⁹⁷PbLead8.10 min

β⁺100.0%

¹⁹⁷TlThallium2.84 h

β⁺100.0%

¹⁹⁷HgMercury2.71 d

EC100.0%

¹⁹⁷AuGoldSTABLE

6-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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