Periodic Table/Fermium/²⁴⁷Fm

← 246Fm248Fm →

²⁴⁷Fm

Fermium-247

Radioactive· Half-life: 31.0 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

100

Neutrons (N)

147

Mass Number (A)

247

Atomic Mass

247.076944AMU

Spin / Parity

7/2+

Binding E/A

7.258keV

Natural Abundance

Trace / None

Half-life

31.0 s

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

α

64.0%

β⁺

Decay Chain

²⁴⁷FmFermium31.0 s

α64.0%

β⁺²⁴⁷Es

²⁴³CfCalifornium10.8 min

β⁺86.0%

α²³⁹Cm14.0%

²⁴³BkBerkelium4.60 h

β⁺100.0%

α²³⁹Am0.15%

²⁴³CmCurium29.1 y

α100.0%

EC²⁴³Am0.29%

²³⁹PuPlutonium24.1 ky

α100.0%

²³⁵UUranium704 My

α100.0%

20Ne²¹⁵Pb8.00%

25Ne²¹⁰Pb8.00%

28Mg²⁰⁷Hg8.00%

²³¹ThThorium1.06 d

β⁻100.0%

²³¹PaProtactinium32.6 ky

α100.0%

24Ne²⁰⁷Tl13.4%

23F²⁰⁸Pb9.90%

²²⁷AcActinium21.8 y

β⁻98.6%

α²²³Fr1.38%

²²⁷ThThorium18.7 d

α100.0%

²²³RaRadium11.4 d

α100.0%

¹⁴C²⁰⁹Pb8.90%

²¹⁹RnRadon3.96 s

α100.0%

²¹⁵PoPolonium1.78 ms

α100.0%

β⁻²¹⁵At2.30%

²¹¹PbLead36.2 min

β⁻100.0%

²¹¹BiBismuth2.14 min

α100.0%

β⁻²¹¹Po0.28%

²⁰⁷TlThallium4.77 min

β⁻100.0%

²⁰⁷PbLeadSTABLE

17-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