Fearmiam (Fm)

chemical element with the atomic number of 100

Atomic Number	100
Atomic Weight	257
Núicléónuimhir	241

Group
Period	7
Block	f

prótón	100 p⁺
neodrón	141 n⁰
leictreon	100 e^-

Physical Property

Ga Adamhach
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
dlús	9.7 g/cm³

Chemical Property

fuinneamh

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
eantalpacht chaighdeánach an fhoirmithe
leictreon

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

Fiúsleictreon	2 ⓘ

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

Staid ocsaídiúcháine	2, 3
Leictridhiúltacht	0.22485
Electrophilicity Index
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point
Melting Point	1,800.15 K
critical pressure
critical temperature
triple point
appearance
dath	Colorless #ffffff #b31fba #b31fba
appearance
Comhéifeacht athraonta
thermodynamic material property
Thermal Conductivity
Forbairt theirmeach
molar heat capacity
Specific Heat Capacity
Cóimheas saintoilleadh teasa
electrical properties
type
electrical conductivity
Friotachas
Forsheoltacht
Maighnéadas
type
So-ghabhálacht mhaighnéadach (Mass)
So-ghabhálacht mhaighnéadach (Molar)
So-ghabhálacht mhaighnéadach (Volume)
magnetic ordering
Teocht Curie
Néel temperature
struchtúr
Crystal Structure	{ERROR}
lattice constant
Lattice Angles
airíonna meicniúla
Cruas
Modal toirte
modal fiartha
modal Young
Cóimheas Poisson
luas forleata fuaime
aicmiúchán
Category	Actinides, Actinides
CAS Group
IUPAC Group
Glawe Number	44
Mendeleev Number	36
Pettifor Number	37
Geochemical Class
Goldschmidt classification	synthetic

eile

Gas Basicity
polarizability	113 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Crosghearradh	5,800
Neutron Mass Absorption
Uimhir chandamach	3H6
space group	()

Isotopes of Fermium

Stable Isotopes	0
Unstable Isotopes	20
Natural Isotopes	0

²⁴¹Fm

Núicléónuimhir	241
neutron number	141
Mais Adamhach Choibhneasta	241.074311 ± 0.000322 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	730 ± 60 us
Guairne	5/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	2008
Paireacht	+

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

²⁴²Fm

Núicléónuimhir	242
neutron number	142
Mais Adamhach Choibhneasta	242.07343 ± 0.00043 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	800 ± 200 us
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1975
Paireacht	+

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

²⁴³Fm

Núicléónuimhir	243
neutron number	143
Mais Adamhach Choibhneasta	243.074414 ± 0.00014 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	231 ± 9 ms
Guairne	7/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1981
Paireacht	-

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

²⁴⁴Fm

Núicléónuimhir	244
neutron number	144
Mais Adamhach Choibhneasta	244.074036 ± 0.000216 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	3.12 ± 0.08 ms
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1967
Paireacht	+

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

²⁴⁵Fm

Núicléónuimhir	245
neutron number	145
Mais Adamhach Choibhneasta	245.075354 ± 0.00021 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	4.2 ± 1.3 s
Guairne	1/2
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1967
Paireacht	+

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

²⁴⁶Fm

Núicléónuimhir	246
neutron number	146
Mais Adamhach Choibhneasta	246.075353334 ± 0.000014675 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	1.54 ± 0.04 s
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1966
Paireacht	+

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

²⁴⁷Fm

Núicléónuimhir	247
neutron number	147
Mais Adamhach Choibhneasta	247.076944 ± 0.000194 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	31 ± 1 s
Guairne	7/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1967
Paireacht	+

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

²⁴⁸Fm

Núicléónuimhir	248
neutron number	148
Mais Adamhach Choibhneasta	248.077185451 ± 0.000009122 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	34.5 ± 1.2 s
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1958
Paireacht	+

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

²⁴⁹Fm

Núicléónuimhir	249
neutron number	149
Mais Adamhach Choibhneasta	249.078926042 ± 0.000006668 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	1.6 ± 0.1 m
Guairne	7/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1960
Paireacht	+

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

²⁵⁰Fm

Núicléónuimhir	250
neutron number	150
Mais Adamhach Choibhneasta	250.079519765 ± 0.000008468 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	31 ± 1.1 m
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1954
Paireacht	+

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

²⁵¹Fm

Núicléónuimhir	251
neutron number	151
Mais Adamhach Choibhneasta	251.08154513 ± 0.000015342 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	5.3 ± 0.08 h
Guairne	9/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1957
Paireacht	-

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

²⁵²Fm

Núicléónuimhir	252
neutron number	152
Mais Adamhach Choibhneasta	252.082466019 ± 0.000005604 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	25.39 ± 0.04 h
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1956
Paireacht	+

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

²⁵³Fm

Núicléónuimhir	253
neutron number	153
Mais Adamhach Choibhneasta	253.085180945 ± 0.000001662 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	3 ± 0.12 d
Guairne	1/2
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1957
Paireacht	+

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

²⁵⁴Fm

Núicléónuimhir	254
neutron number	154
Mais Adamhach Choibhneasta	254.086852424 ± 0.000001978 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	3.24 ± 0.002 h
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1954
Paireacht	+

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

²⁵⁵Fm

Núicléónuimhir	255
neutron number	155
Mais Adamhach Choibhneasta	255.089963495 ± 0.000004223 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	20.07 ± 0.07 h
Guairne	7/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1954
Paireacht	+

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

²⁵⁶Fm

Núicléónuimhir	256
neutron number	156
Mais Adamhach Choibhneasta	256.091771699 ± 0.000003241 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	157.1 ± 1.3 m
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1955
Paireacht	+

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

²⁵⁷Fm

Núicléónuimhir	257
neutron number	157
Mais Adamhach Choibhneasta	257.095105419 ± 0.000004669 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	100.5 ± 0.2 d
Guairne	9/2
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1964
Paireacht	+

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

²⁵⁸Fm

Núicléónuimhir	258
neutron number	158
Mais Adamhach Choibhneasta	258.097077 ± 0.000215 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	370 ± 14 us
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh	1971
Paireacht	+

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

²⁵⁹Fm

Núicléónuimhir	259
neutron number	159
Mais Adamhach Choibhneasta	259.100596 ± 0.000304 Da
G-fhachtóir
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré	1.5 ± 0.2 s
Guairne
nuclear quadrupole moment
dáta fionnachtana nó tionscnaimh	1980
Paireacht

decay mode	intensity
SF (spontaneous fission)	100%

²⁶⁰Fm

Núicléónuimhir	260
neutron number	160
Mais Adamhach Choibhneasta	260.102809 ± 0.000467 Da
G-fhachtóir	0
natural abundance
Meath radaighníomhach	☢️ radioactive element
leathré
Guairne	0
nuclear quadrupole moment	0
dáta fionnachtana nó tionscnaimh
Paireacht	+

decay mode	intensity
SF (spontaneous fission)

stair

fionnachtaí nó aireagóir	Argonne, Los Alamos, U of Calif
áit ar tháinig air/uirthi	United States
dáta fionnachtana nó tionscnaimh	1953
Sanasaíocht	Named in honor of the scientist Enrico Fermi.
pronunciation	FER-mi-em (Béarla)

foinse

Abundance
Abundance in Earth's crust
natural abundance (aigéan)
natural abundance (corp an duine)	0 %
natural abundance (dreigeoideach)	0 %
natural abundance (An Ghrian)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Fearmiam on ChemicalAid

Australian Educational Vocabulary ID	scot/3519
ChEBI ID	33394
ChemSpider ID	22434
DSSTOX compound identifier	DTXCID60147884
DSSTox substance ID	DTXSID60225393
Den Store Danske ID	fermium
Encyclopædia Britannica Online ID	science/fermium
Encyclopædia Universalis ID	fermium
Freebase ID	/m/025rqck
Great Russian Encyclopedia Online ID	4709674
ID GND	4490995-0
ID Gran Enciclopèdia Catalana	0108657
InChI	InChI=1S/Fm
InChIKey	MIORUQGGZCBUGO-UHFFFAOYSA-N
KBpedia ID	Fermium
MeSH descriptor ID	D005286
OmegaWiki Defined Meaning	158627
PubChem CID	23998
Römpp online ID	RD-06-00507
Store norske leksikon ID	fermium
Treccani ID	fermio
UNII	Q70I3KBF4W
USGS Thesaurus ID	1453
WordNet 3.1 Synset ID	14661517-n
uimhir CAS	7440-72-4

Fearmiam (Fm)

Physical Property

Chemical Property

eile

Isotopes of Fermium

241Fm

242Fm

243Fm

244Fm

245Fm

246Fm

247Fm

248Fm

249Fm

250Fm

251Fm

252Fm

253Fm

254Fm

255Fm

256Fm

257Fm

258Fm

259Fm

260Fm

stair

foinse

Nuclear Screening Constants

²⁴¹Fm

²⁴²Fm

²⁴³Fm

²⁴⁴Fm

²⁴⁵Fm

²⁴⁶Fm

²⁴⁷Fm

²⁴⁸Fm

²⁴⁹Fm

²⁵⁰Fm

²⁵¹Fm

²⁵²Fm

²⁵³Fm

²⁵⁴Fm

²⁵⁵Fm

²⁵⁶Fm

²⁵⁷Fm

²⁵⁸Fm

²⁵⁹Fm

²⁶⁰Fm