Periodic Table/Thallium/¹⁸⁵Tl

← 184Tl186Tl →

¹⁸⁵Tl

Thallium-185

Radioactive· Half-life: 19.5 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

81

Neutrons (N)

104

Mass Number (A)

185

Atomic Mass

184.978789AMU

Spin / Parity

1/2+

Binding E/A

7.612keV

Natural Abundance

Trace / None

Half-life

19.5 s

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

β⁺

100.0%

α

Decay Chain

¹⁸⁵TlThallium19.5 s

β⁺100.0%

α¹⁸¹Au

¹⁸⁵HgMercury49.1 s

β⁺94.0%

α¹⁸¹Pt6.00%

¹⁸⁵AuGold4.25 min

β⁺99.7%

α¹⁸¹Ir0.26%

¹⁸⁵PtPlatinum1.18 h

β⁺100.0%

α¹⁸¹Os0.01%

¹⁸⁵IrIridium14.4 h

β⁺100.0%

¹⁸⁵OsOsmium93.0 d

EC100.0%

¹⁸⁵ReRheniumSTABLE

7-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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