Periodic Table/Francium/¹⁹⁹Fr

← 198Fr200Fr →

¹⁹⁹Fr

Francium-199

Radioactive· Half-life: 6.60 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

87

Neutrons (N)

112

Mass Number (A)

199

Atomic Mass

199.007269AMU

Spin / Parity

1/2+

Binding E/A

7.472keV

Natural Abundance

Trace / None

Half-life

6.60 ms

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

α

100.0%

β⁺

Decay Chain

¹⁹⁹FrFrancium6.60 ms

α100.0%

β⁺¹⁹⁹Rn

¹⁹⁵AtAstatine290 ms

α100.0%

β⁺¹⁹⁵Po

¹⁹¹BiBismuth12.4 s

α51.0%

β⁺¹⁹¹Pb

¹⁸⁷TlThallium?

β⁺100.0%

α¹⁸³Au

¹⁸⁷HgMercury1.90 min

β⁺100.0%

α¹⁸³Pt

¹⁸⁷AuGold8.30 min

β⁺100.0%

α¹⁸³Ir

¹⁸⁷PtPlatinum2.35 h

β⁺100.0%

¹⁸⁷IrIridium10.5 h

β⁺100.0%

¹⁸⁷OsOsmiumSTABLE

9-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