Periodic Table/Francium/²⁰⁵Fr

← 204Fr206Fr →

²⁰⁵Fr

Francium-205

Radioactive· Half-life: 3.90 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

87

Neutrons (N)

118

Mass Number (A)

205

Atomic Mass

204.998594AMU

Spin / Parity

9/2-

Binding E/A

7.529keV

Natural Abundance

Trace / None

Half-life

3.90 s

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

α

98.5%

β⁺

1.5%

Decay Chain

²⁰⁵FrFrancium3.90 s

α98.5%

β⁺²⁰⁵Rn1.50%

²⁰¹AtAstatine1.42 min

α71.0%

β⁺²⁰¹Po29.0%

¹⁹⁷BiBismuth9.33 min

β⁺100.0%

α¹⁹³Tl

¹⁹⁷PbLead8.10 min

β⁺100.0%

¹⁹⁷TlThallium2.84 h

β⁺100.0%

¹⁹⁷HgMercury2.71 d

EC100.0%

¹⁹⁷AuGoldSTABLE

7-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