Periodic Table/Radium/²⁰⁸Ra

← 207Ra209Ra →

²⁰⁸Ra

Radium-208

Radioactive· Half-life: 1.11 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

88

Neutrons (N)

120

Mass Number (A)

208

Atomic Mass

208.001855AMU

Spin / Parity

0+

Binding E/A

7.516keV

Natural Abundance

Trace / None

Half-life

1.11 s

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

α

87.0%

β⁺

Decay Chain

²⁰⁸RaRadium1.11 s

α87.0%

β⁺²⁰⁸Fr

²⁰⁴RnRadon1.24 min

α72.4%

β⁺²⁰⁴At

²⁰⁰PoPolonium11.5 min

β⁺88.9%

α¹⁹⁶Pb11.1%

²⁰⁰BiBismuth36.4 min

β⁺100.0%

²⁰⁰PbLead21.5 h

EC100.0%

²⁰⁰TlThallium1.09 d

β⁺100.0%

²⁰⁰HgMercurySTABLE

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

Other Isotopes of Radium

201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235

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