Fm - Fermium

Fermium was discovered by Choppin, Thompson, Ghioros and Harvey in 1952. Fortunately for the reat of the campus, there is no fermium in our lab.

Atomic number - 100 Density g/mL -
Atomic weight u 257 Melting point K -
Bonding radius A - Boiling point K -
Atomic radius A - Heat of vaporization kJ/mol -
Ionization Potential V 6 .5 Heat of fusion kJ/mol -
Electronegativity - 1 .3 Specific heat J/gK -
The oxide is unknown.
Crystal are unknown.

Electron config. : [Rn] 5f12 7s2

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113
Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Fm: Click mass number for decay process, product for element page.
242
0.8 msec
SF,5.600 MeV
?
242.07338 		243
0.18 sec
a/SF,8.690
Cf-239/?
243.07450 		244
3.3 msec
SF,7.950 MeV
?
244.07418 		245
4.2 sec
a/SF,8.440
Cf-241/?
245.07536 		246
1.1 sec
a/EC/SF,8.374
Cf-242/Es-246/?
246.07527 		247
35 sec
a/EC,8.190
Cf-243/Es-247
247.07677 		248
36 sec
a/EC/SF,8.002
Cf-244/Es-248/?
248.07718
249
2.6 min
a/EC,2.440
Cf-245/Es-249
249.07902 		250
30 min
a/EC/SF,7.557
Cf-246/Es-250/?
250.07951 		251
5.30 hr
a/EC,1.474
Cf-247/Es-251
251.08156 		252
25.39 hr
a/SF,7.153
Cf-248/?
252.08245 		253
3.00 da
a/EC,6.739
Cf-249/Es-253
253.08517 		254
3.240 hr
a/SF,7.307
Cf-250/?
254.08684 		255
20.07 hr
a/SF,7.241
Cf-251/?
255.08995
256
157.6 min
a/SF,1.670
Cf-252/?
256.09176 		257
100.5 da
a/SF,6.864
Cf-253/?
257.09509 		258
370 usec
SF,9.010 MeV
?
258.09711 		259
1.5 sec
SF,3.380 MeV
?
259.10059 		260
4 msec
SF,1.810 MeV
?
260.0 		MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.