Periodic Table/Radium/²⁰⁹Ra

← 208Ra210Ra →

²⁰⁹Ra

Radium-209

Radioactive· Half-life: 4.71 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

88

Neutrons (N)

121

Mass Number (A)

209

Atomic Mass

209.001995AMU

Spin / Parity

5/2-

Binding E/A

7.518keV

Natural Abundance

Trace / None

Half-life

4.71 s

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

α

100.0%

β⁺

Decay Chain

²⁰⁹RaRadium4.71 s

α100.0%

β⁺²⁰⁹Fr

²⁰⁵RnRadon2.83 min

β⁺75.4%

α²⁰¹Po24.6%

²⁰⁵AtAstatine26.9 min

β⁺90.0%

α²⁰¹Bi10.0%

²⁰⁵PoPolonium1.74 h

β⁺100.0%

α²⁰¹Pb0.04%

²⁰⁵BiBismuth14.9 d

β⁺100.0%

²⁰⁵PbLead17.0 My

EC100.0%

²⁰⁵TlThalliumSTABLE

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

← Back to RadiumData: IAEA NDS · ENSDF