Periodic Table/Thallium/²⁰⁹Tl

← 208Tl210Tl →

²⁰⁹Tl

Thallium-209

Radioactive· Half-life: 2.16 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

81

Neutrons (N)

128

Mass Number (A)

209

Atomic Mass

208.985352AMU

Spin / Parity

1/2+

Binding E/A

7.635keV

Natural Abundance

Trace / None

Half-life

2.16 min

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

β⁻

100.0%

β⁻n

Decay Chain

²⁰⁹TlThallium2.16 min

β⁻100.0%

β⁻n²⁰⁸Pb

²⁰⁹PbLead3.23 h

β⁻100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

4-step decay chain → stable · Primary path shown · branching ratios indicated

Other Isotopes of Thallium

176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218

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