Periodic Table/Astatine/¹⁹⁹At

← 198At200At →

¹⁹⁹At

Astatine-199

Radioactive· Half-life: 7.02 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

85

Neutrons (N)

114

Mass Number (A)

199

Atomic Mass

198.990528AMU

Spin / Parity

9/2-

Binding E/A

7.563keV

Natural Abundance

Trace / None

Half-life

7.02 s

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

α

89.0%

β⁺

Decay Chain

¹⁹⁹AtAstatine7.02 s

α89.0%

β⁺¹⁹⁹Po

¹⁹⁵BiBismuth3.05 min

β⁺100.0%

α¹⁹¹Tl0.03%

¹⁹⁵PbLead15.0 min

β⁺100.0%

¹⁹⁵TlThallium1.16 h

β⁺100.0%

¹⁹⁵HgMercury10.7 h

β⁺100.0%

¹⁹⁵AuGold186 d

EC100.0%

¹⁹⁵PtPlatinumSTABLE

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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