Periodic Table/Astatine/²²⁰At

← 219At221At →

²²⁰At

Astatine-220

Radioactive· Half-life: 3.71 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

85

Neutrons (N)

135

Mass Number (A)

220

Atomic Mass

220.015433AMU

Spin / Parity

3-

Binding E/A

7.506keV

Natural Abundance

Trace / None

Half-life

3.71 min

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

β⁻

92.0%

α

8.0%

Decay Chain

²²⁰AtAstatine3.71 min

β⁻92.0%

α²¹⁶Bi8.00%

²²⁰RnRadon55.6 s

α100.0%

2β⁻²²⁰Ra

²¹⁶PoPolonium144 ms

α100.0%

2β⁻²¹⁶Rn

²¹²PbLead10.6 h

β⁻100.0%

²¹²BiBismuth1.01 h

β⁻64.1%

α²⁰⁸Tl35.9%

β⁻α²⁰⁸Pb0.01%

²¹²PoPolonium294 ns

α100.0%

²⁰⁸PbLeadSTABLE

7-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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