Fermium (Fm)

chemical element with the atomic number of 100

Atomic Number	100
Atomic Weight	257
Numri i masës	241

Group
Period	7
Block	f

protoni	100 p⁺
neutroni	141 n⁰
elektroni	100 e^-

Tipar Fizik

Atomic Radius
molar volume
covalent radius	167 pm
Metallic Radius
ionic radius	110,5 pm
Crystal Radius	124,5 pm
Van der Waals radius	245 pm 328,6 pm
density	9,7 g/cm³

Chemical Property

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energjia

proton affinity
electron affinity
ionization energy	6,5 eV/particle 10 eV/particle 23,2 eV/particle 39,3 eV/particle 55 eV/particle 74 eV/particle 93 eV/particle 120 eV/particle 136 eV/particle 162 eV/particle 185 eV/particle 209 eV/particle 237 eV/particle 257 eV/particle 276 eV/particle 300 eV/particle 326 eV/particle 351 eV/particle 377 eV/particle 402 eV/particle 430 eV/particle 453 eV/particle 616 eV/particle 647 eV/particle 680 eV/particle 716 eV/particle 749 eV/particle 782 eV/particle 837 eV/particle 871 eV/particle 909 eV/particle 944 eV/particle 1 110 eV/particle 1 150 eV/particle 1 190 eV/particle 1 230 eV/particle 1 370 eV/particle 1 420 eV/particle 1 550 eV/particle 1 600 eV/particle 1 770 eV/particle 1 860 eV/particle 1 940 eV/particle 2 030 eV/particle 2 120 eV/particle 2 210 eV/particle 2 300 eV/particle 2 390 eV/particle 2 490 eV/particle 2 590 eV/particle 2 680 eV/particle 2 760 eV/particle 2 900 eV/particle 2 950 eV/particle 3 403 eV/particle 3 480 eV/particle 3 561 eV/particle 3 647 eV/particle 3 730 eV/particle 3 810 eV/particle 3 986 eV/particle 4 070 eV/particle 4 160 eV/particle 4 245 eV/particle 4 586 eV/particle 4 670 eV/particle 4 760 eV/particle 4 840 eV/particle 5 420 eV/particle 5 510 eV/particle 5 760 eV/particle 5 860 eV/particle 9 200 eV/particle 9 370 eV/particle 9 570 eV/particle 9 770 eV/particle 9 970 eV/particle 10 160 eV/particle 10 660 eV/particle 10 860 eV/particle 11 080 eV/particle 11 280 eV/particle 11 850 eV/particle 12 020 eV/particle 12 220 eV/particle 12 390 eV/particle 14 180 eV/particle 14 400 eV/particle 14 800 eV/particle 15 000 eV/particle 30 300 eV/particle 30 800 eV/particle 31 300 eV/particle 31 800 eV/particle 38 400 eV/particle 39 100 eV/particle 40 000 eV/particle 40 482,2 eV/particle 158 152,5 eV/particle 160 804 eV/particle

enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation
elektroni

electron shell	2, 8, 18, 32, 30, 8, 2

valence electron	2 ⓘ

konfigurimi i elektronit	[Rn] 5f¹² 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹² 7s²

oxidation number	2, 3
Elektronegativiteti	0.22485
Electrophilicity Index
fundamental state of matter

gjendja agregate e materies
gaseous state of matter
Boiling Point
Melting Point	1 800,15 K
critical pressure
critical temperature
triple point
appearance
Ngjyra	Black #ffffff #b31fba #b31fba
appearance
refractive index
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
electrical conductivity
electrical resistivity
Superpërcjellshmëria
Magnetizimi
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
strukturë
Crystal Structure	{ERROR}
lattice constant
Lattice Angles
mechanical property
hardness
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
Shpejtësia e zërit
klasifikim
Category	Actinides, Actinides
CAS Group
IUPAC Group
Glawe Number	44
Mendeleev Number	36
Pettifor Number	37
Geochemical Class
Goldschmidt classification	synthetic

other

Gas Basicity
polarizability	113 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	5 800
Neutron Mass Absorption
numër kuantik	3H6
space group	()

Isotopes of Fermium

Stable Isotopes	0
Unstable Isotopes	20
Natural Isotopes	0

²⁴¹Fm

Numri i masës	241
numri i neutroneve	141
Relative Atomic Mass	241,074311 ± 0,000322 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	730 ± 60 us
Spini	5/2
nuclear quadrupole moment
koha e zbulimit apo shpikjes	2008
parity	+

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

²⁴²Fm

Numri i masës	242
numri i neutroneve	142
Relative Atomic Mass	242,07343 ± 0,00043 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	800 ± 200 us
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1975
parity	+

decay mode	intensitet
SF (spontaneous fission)	100%
α (α emission)

²⁴³Fm

Numri i masës	243
numri i neutroneve	143
Relative Atomic Mass	243,074414 ± 0,00014 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	231 ± 9 ms
Spini	7/2
nuclear quadrupole moment
koha e zbulimit apo shpikjes	1981
parity	-

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

²⁴⁴Fm

Numri i masës	244
numri i neutroneve	144
Relative Atomic Mass	244,074036 ± 0,000216 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	3,12 ± 0,08 ms
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1967
parity	+

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

²⁴⁵Fm

Numri i masës	245
numri i neutroneve	145
Relative Atomic Mass	245,075354 ± 0,00021 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	4,2 ± 1,3 s
Spini	1/2
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1967
parity	+

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

²⁴⁶Fm

Numri i masës	246
numri i neutroneve	146
Relative Atomic Mass	246,075353334 ± 0,000014675 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	1,54 ± 0,04 s
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1966
parity	+

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

²⁴⁷Fm

Numri i masës	247
numri i neutroneve	147
Relative Atomic Mass	247,076944 ± 0,000194 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	31 ± 1 s
Spini	7/2
nuclear quadrupole moment
koha e zbulimit apo shpikjes	1967
parity	+

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

²⁴⁸Fm

Numri i masës	248
numri i neutroneve	148
Relative Atomic Mass	248,077185451 ± 0,000009122 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	34,5 ± 1,2 s
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1958
parity	+

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

²⁴⁹Fm

Numri i masës	249
numri i neutroneve	149
Relative Atomic Mass	249,078926042 ± 0,000006668 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	1,6 ± 0,1 m
Spini	7/2
nuclear quadrupole moment
koha e zbulimit apo shpikjes	1960
parity	+

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

²⁵⁰Fm

Numri i masës	250
numri i neutroneve	150
Relative Atomic Mass	250,079519765 ± 0,000008468 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	31 ± 1,1 m
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1954
parity	+

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

²⁵¹Fm

Numri i masës	251
numri i neutroneve	151
Relative Atomic Mass	251,08154513 ± 0,000015342 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	5,3 ± 0,08 h
Spini	9/2
nuclear quadrupole moment
koha e zbulimit apo shpikjes	1957
parity	-

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

²⁵²Fm

Numri i masës	252
numri i neutroneve	152
Relative Atomic Mass	252,082466019 ± 0,000005604 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	25,39 ± 0,04 h
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1956
parity	+

decay mode	intensitet
α (α emission)	100%
SF (spontaneous fission)	0.0023%
2β⁺ (double β⁺ decay)

²⁵³Fm

Numri i masës	253
numri i neutroneve	153
Relative Atomic Mass	253,085180945 ± 0,000001662 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	3 ± 0,12 d
Spini	1/2
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1957
parity	+

decay mode	intensitet
ϵ (electron capture)	88%
α (α emission)	12%

²⁵⁴Fm

Numri i masës	254
numri i neutroneve	154
Relative Atomic Mass	254,086852424 ± 0,000001978 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	3,24 ± 0,002 h
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1954
parity	+

decay mode	intensitet
α (α emission)	99.9408%
SF (spontaneous fission)	0.0592%

²⁵⁵Fm

Numri i masës	255
numri i neutroneve	155
Relative Atomic Mass	255,089963495 ± 0,000004223 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	20,07 ± 0,07 h
Spini	7/2
nuclear quadrupole moment
koha e zbulimit apo shpikjes	1954
parity	+

decay mode	intensitet
α (α emission)	100%
SF (spontaneous fission)	2.4%

²⁵⁶Fm

Numri i masës	256
numri i neutroneve	156
Relative Atomic Mass	256,091771699 ± 0,000003241 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	157,1 ± 1,3 m
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1955
parity	+

decay mode	intensitet
SF (spontaneous fission)	91.9%
α (α emission)	8.1%

²⁵⁷Fm

Numri i masës	257
numri i neutroneve	157
Relative Atomic Mass	257,095105419 ± 0,000004669 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	100,5 ± 0,2 d
Spini	9/2
nuclear quadrupole moment
koha e zbulimit apo shpikjes	1964
parity	+

decay mode	intensitet
α (α emission)	99.79%
SF (spontaneous fission)	0.21%

²⁵⁸Fm

Numri i masës	258
numri i neutroneve	158
Relative Atomic Mass	258,097077 ± 0,000215 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	370 ± 14 us
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes	1971
parity	+

decay mode	intensitet
SF (spontaneous fission)	100%
α (α emission)

²⁵⁹Fm

Numri i masës	259
numri i neutroneve	159
Relative Atomic Mass	259,100596 ± 0,000304 Da
g-factor
natural abundance
Radioaktivitet	☢️ radioactive element
half-life	1,5 ± 0,2 s
Spini
nuclear quadrupole moment
koha e zbulimit apo shpikjes	1980
parity

decay mode	intensitet
SF (spontaneous fission)	100%

²⁶⁰Fm

Numri i masës	260
numri i neutroneve	160
Relative Atomic Mass	260,102809 ± 0,000467 Da
g-factor	0
natural abundance
Radioaktivitet	☢️ radioactive element
half-life
Spini	0
nuclear quadrupole moment	0
koha e zbulimit apo shpikjes
parity	+

decay mode	intensitet
SF (spontaneous fission)

historia

zbulues	Argonne, Los Alamos, U of Calif
vendndodhja e zbulimit	United States
koha e zbulimit apo shpikjes	1953
Etimologjia	Named in honor of the scientist Enrico Fermi.
pronunciation	FER-mi-em (anglisht)

burim

Abundance
Abundance in Earth's crust
natural abundance (Oqeani)
natural abundance (Trupi i njeriut)	0 %
natural abundance (meteoroid)	0 %
natural abundance (Diell)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Fermium on ChemicalAid

Fermium (Fm)

Tipar Fizik

Chemical Property

other

Isotopes of Fermium

241Fm

242Fm

243Fm

244Fm

245Fm

246Fm

247Fm

248Fm

249Fm

250Fm

251Fm

252Fm

253Fm

254Fm

255Fm

256Fm

257Fm

258Fm

259Fm

260Fm

historia

burim

Nuclear Screening Constants

²⁴¹Fm

²⁴²Fm

²⁴³Fm

²⁴⁴Fm

²⁴⁵Fm

²⁴⁶Fm

²⁴⁷Fm

²⁴⁸Fm

²⁴⁹Fm

²⁵⁰Fm

²⁵¹Fm

²⁵²Fm

²⁵³Fm

²⁵⁴Fm

²⁵⁵Fm

²⁵⁶Fm

²⁵⁷Fm

²⁵⁸Fm

²⁵⁹Fm

²⁶⁰Fm