Periodic Table/Francium/²⁰⁹Fr

← 208Fr210Fr →

²⁰⁹Fr

Francium-209

Radioactive· Half-life: 50.5 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

87

Neutrons (N)

122

Mass Number (A)

209

Atomic Mass

208.995940AMU

Spin / Parity

9/2-

Binding E/A

7.551keV

Natural Abundance

Trace / None

Half-life

50.5 s

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

α

89.0%

β⁺

11.0%

Decay Chain

²⁰⁹FrFrancium50.5 s

α89.0%

β⁺²⁰⁹Rn11.0%

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

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

Other Isotopes of Francium

197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233

← Back to FranciumData: IAEA NDS · ENSDF