Periodic Table/Gold/²⁰⁹Au

← 208Au210Au →

²⁰⁹Au

Gold-209

Radioactive

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

79

Neutrons (N)

130

Mass Number (A)

209

Atomic Mass

208.997606AMU

Spin / Parity

3/2+

Binding E/A

7.593keV

Natural Abundance

Trace / None

Half-life

Unknown

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

β⁻

β⁻n

Decay Chain

²⁰⁹AuGold?

β⁻

β⁻n²⁰⁸Hg

²⁰⁹HgMercury6.30 s

β⁻100.0%

β⁻n²⁰⁸Tl

²⁰⁹TlThallium2.16 min

β⁻100.0%

β⁻n²⁰⁸Pb

²⁰⁹PbLead3.23 h

β⁻100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

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

Other Isotopes of Gold

168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210

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