Periodic Table/Francium/²²⁰Fr

← 219Fr221Fr →

²²⁰Fr

Francium-220

Radioactive· Half-life: 27.4 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

87

Neutrons (N)

133

Mass Number (A)

220

Atomic Mass

220.012327AMU

Spin / Parity

1+

Binding E/A

7.508keV

Natural Abundance

Trace / None

Half-life

27.4 s

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

α

100.0%

β⁻

0.3%

Decay Chain

²²⁰FrFrancium27.4 s

α100.0%

β⁻²²⁰Ra0.35%

²¹⁶AtAstatine300 μs

α100.0%

β⁻²¹⁶Rn

EC²¹⁶Po

²¹²BiBismuth1.01 h

β⁻64.1%

α²⁰⁸Tl35.9%

β⁻α²⁰⁸Pb0.01%

²¹²PoPolonium294 ns

α100.0%

²⁰⁸PbLeadSTABLE

5-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