Periodic Table/Fermium/²⁴³Fm

← 242Fm244Fm →

²⁴³Fm

Fermium-243

Radioactive· Half-life: 231 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

100

Neutrons (N)

143

Mass Number (A)

243

Atomic Mass

243.074414AMU

Spin / Parity

7/2-

Binding E/A

7.254keV

Natural Abundance

Trace / None

Half-life

231 ms

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

α

91.0%

SF

9.0%

β⁺

Decay Chain

²⁴³FmFermium231 ms

α91.0%

β⁺²⁴³Es

²³⁹CfCalifornium28.0 s

α65.0%

β⁺²³⁹Bk

²³⁵CmCurium7.00 min

α4.00%

β⁺²³⁵Am

²³¹PuPlutonium8.60 min

α13.0%

β⁺²³¹Np

²²⁷UUranium1.10 min

α100.0%

β⁺²²⁷Pa

²²³ThThorium600 ms

α100.0%

²¹⁹RaRadium9.00 ms

α100.0%

²¹⁵RnRadon2.30 μs

α100.0%

²¹¹PoPolonium516 ms

α100.0%

²⁰⁷PbLeadSTABLE

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

Other Isotopes of Fermium

241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260

← Back to FermiumData: IAEA NDS · ENSDF