Fermij[um]

Fermij[um] (Fm)

hemijski element sa simbolom Fm i atomskim brojem 100
Atomic Number100
Atomic Weight257
Maseni broj241
Group
Period7
Blockf
Proton100 p+
Neutron141 n0
Elektron100 e-
Animated Bohrov model atoma of Fm (Fermij[um])

Physical Property

Atomski Radijus
Molarni volumen
covalent radius
167 pm
Metallic Radius
Ionski radijus
110,5 pm
Crystal Radius
124,5 pm
Van der Waalsov radijus
245 pm
gustoća
9,7 g/cm³

Chemical Property

energija
proton affinity
electron affinity
ionization energy
ionization energy of Fm (Fermij[um])
Toplota isparavanja
toplota topljenja
standard enthalpy of formation
Elektron
electron shell2, 8, 18, 32, 30, 8, 2
Bohrov model atoma: Fm (Fermij[um])
Valentni elektron2
Lewis structure: Fm (Fermij[um])
electron configuration[Rn] 5f12 7s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 5f12 7s2
Enhanced Bohrov model atoma of Fm (Fermij[um])
Orbital Diagram of Fm (Fermij[um])
oksidacijsko stanje2, 3
Elektronegativnost
Electrophilicity Index
fundamental state of matter
agregatno stanjeSolid
gaseous state of matter
Boiling Point
Melting Point
1.800,15 K
critical pressure
Kritična temperatura
Trojna tačka
appearance
boja
Colorless
appearance
Indeks prelamanja
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
Specifična električna provodljivost
electrical resistivity
Superprovodljivost
Magnetizam
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Kirijeva tačka
Néel temperature
struktura
Crystal Structure ()
lattice constant
Lattice Angles
mechanical property
Tvrdoća
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
Brzina zvuka
klasifikacija
CategoryActinides, Actinides
CAS Group
IUPAC Group
Glawe Number44
Mendeleev Number36
Pettifor Number37
Geochemical Class
Goldschmidt classificationsynthetic

other

Gas Basicity
polarizability
113 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
5.800
Neutron Mass Absorption
Kvantni brojevi3H6
space group ()

Isotopes of Fermium

Stable Isotopes0
Unstable Isotopes20
Natural Isotopes0

241Fm

Maseni broj241
broj neutrona141
relative atomic mass
241,074311 ± 0,000322 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
730 ± 60 us
spin5/2
nuclear quadrupole moment
datum otkrića2008
parity+

decay modeintensity
SF (spontaneous fission)
α (α emission)14%
β+ (β+ decay; β+ = ϵ + e+)12%

242Fm

Maseni broj242
broj neutrona142
relative atomic mass
242,07343 ± 0,00043 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
800 ± 200 us
spin0
nuclear quadrupole moment
0
datum otkrića1975
parity+

decay modeintensity
SF (spontaneous fission)100%
α (α emission)

243Fm

Maseni broj243
broj neutrona143
relative atomic mass
243,074414 ± 0,00014 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
231 ± 9 ms
spin7/2
nuclear quadrupole moment
datum otkrića1981
parity-

decay modeintensity
α (α emission)91%
SF (spontaneous fission)9%
β+ (β+ decay; β+ = ϵ + e+)

244Fm

Maseni broj244
broj neutrona144
relative atomic mass
244,074036 ± 0,000216 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
3,12 ± 0,08 ms
spin0
nuclear quadrupole moment
0
datum otkrića1967
parity+

decay modeintensity
SF (spontaneous fission)97%
β+ (β+ decay; β+ = ϵ + e+)2%
α (α emission)1%

245Fm

Maseni broj245
broj neutrona145
relative atomic mass
245,075354 ± 0,00021 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
4,2 ± 1,3 s
spin1/2
nuclear quadrupole moment
0
datum otkrića1967
parity+

decay modeintensity
α (α emission)100%
β+ (β+ decay; β+ = ϵ + e+)7%
SF (spontaneous fission)0.3%

246Fm

Maseni broj246
broj neutrona146
relative atomic mass
246,075353334 ± 0,000014675 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
1,54 ± 0,04 s
spin0
nuclear quadrupole moment
0
datum otkrića1966
parity+

decay modeintensity
α (α emission)93.2%
SF (spontaneous fission)6.8%
ϵ (electron capture)1.3%

247Fm

Maseni broj247
broj neutrona147
relative atomic mass
247,076944 ± 0,000194 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
31 ± 1 s
spin7/2
nuclear quadrupole moment
datum otkrića1967
parity+

decay modeintensity
α (α emission)64%
β+ (β+ decay; β+ = ϵ + e+)

248Fm

Maseni broj248
broj neutrona148
relative atomic mass
248,077185451 ± 0,000009122 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
34,5 ± 1,2 s
spin0
nuclear quadrupole moment
0
datum otkrića1958
parity+

decay modeintensity
α (α emission)100%
β+ (β+ decay; β+ = ϵ + e+)
SF (spontaneous fission)0.1%

249Fm

Maseni broj249
broj neutrona149
relative atomic mass
249,078926042 ± 0,000006668 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
1,6 ± 0,1 m
spin7/2
nuclear quadrupole moment
datum otkrića1960
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)
α (α emission)33%

250Fm

Maseni broj250
broj neutrona150
relative atomic mass
250,079519765 ± 0,000008468 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
31 ± 1,1 m
spin0
nuclear quadrupole moment
0
datum otkrića1954
parity+

decay modeintensity
α (α emission)100%
SF (spontaneous fission)0.0069%
ϵ (electron capture)

251Fm

Maseni broj251
broj neutrona151
relative atomic mass
251,08154513 ± 0,000015342 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
5,3 ± 0,08 h
spin9/2
nuclear quadrupole moment
datum otkrića1957
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)98.2%
α (α emission)1.8%

252Fm

Maseni broj252
broj neutrona152
relative atomic mass
252,082466019 ± 0,000005604 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
25,39 ± 0,04 h
spin0
nuclear quadrupole moment
0
datum otkrića1956
parity+

decay modeintensity
α (α emission)100%
SF (spontaneous fission)0.0023%
+ (double β+ decay)

253Fm

Maseni broj253
broj neutrona153
relative atomic mass
253,085180945 ± 0,000001662 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
3 ± 0,12 d
spin1/2
nuclear quadrupole moment
0
datum otkrića1957
parity+

decay modeintensity
ϵ (electron capture)88%
α (α emission)12%

254Fm

Maseni broj254
broj neutrona154
relative atomic mass
254,086852424 ± 0,000001978 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
3,24 ± 0,002 h
spin0
nuclear quadrupole moment
0
datum otkrića1954
parity+

decay modeintensity
α (α emission)99.9408%
SF (spontaneous fission)0.0592%

255Fm

Maseni broj255
broj neutrona155
relative atomic mass
255,089963495 ± 0,000004223 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
20,07 ± 0,07 h
spin7/2
nuclear quadrupole moment
datum otkrića1954
parity+

decay modeintensity
α (α emission)100%
SF (spontaneous fission)2.4%

256Fm

Maseni broj256
broj neutrona156
relative atomic mass
256,091771699 ± 0,000003241 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
157,1 ± 1,3 m
spin0
nuclear quadrupole moment
0
datum otkrića1955
parity+

decay modeintensity
SF (spontaneous fission)91.9%
α (α emission)8.1%

257Fm

Maseni broj257
broj neutrona157
relative atomic mass
257,095105419 ± 0,000004669 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
100,5 ± 0,2 d
spin9/2
nuclear quadrupole moment
datum otkrića1964
parity+

decay modeintensity
α (α emission)99.79%
SF (spontaneous fission)0.21%

258Fm

Maseni broj258
broj neutrona158
relative atomic mass
258,097077 ± 0,000215 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
370 ± 14 us
spin0
nuclear quadrupole moment
0
datum otkrića1971
parity+

decay modeintensity
SF (spontaneous fission)100%
α (α emission)

259Fm

Maseni broj259
broj neutrona159
relative atomic mass
259,100596 ± 0,000304 Da
g-factor
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
1,5 ± 0,2 s
spin
nuclear quadrupole moment
datum otkrića1980
parity

decay modeintensity
SF (spontaneous fission)100%

260Fm

Maseni broj260
broj neutrona160
relative atomic mass
260,102809 ± 0,000467 Da
g-factor
0
natural abundance
Radioaktivnost☢️ radioactive element
Vrijeme poluraspada
spin0
nuclear quadrupole moment
0
datum otkrića
parity+

decay modeintensity
SF (spontaneous fission)
Fermium-Ytterbium Alloy
Electron shell 100 Fermium

historija

otkrivač ili izumiteljArgonne, Los Alamos, U of Calif
mjesto otkrićaUnited States
datum otkrića1953
EtimologijaNamed in honor of the scientist Enrico Fermi.
pronunciationFER-mi-em (engleski)

izvor

Abundance
Abundance in Earth's crust
natural abundance (okean)
natural abundance (ljudsko tijelo)
0 %
natural abundance (Meteoroidi)
0 %
natural abundance (Sunce)
0 %
Abundance in Universe
0 %

Nuclear Screening Constants