Fermium (Fm)

chemical element with the atomic number of 100

Atomic Number	100
Atomic Weight	257
massiarv	241

Group
Period	7
Block	f

prooton	100 p⁺
neutron	141 n⁰
elektron	100 e^-

Animated Bohri aatomiteooria of Fm (Fermium)

Füüsikalised Omadused

Aatomiraadius
molaarruumala
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

Keemilised Omadused

energia

proton affinity
Elektronafiinsus
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

aurustumissoojus
sulamissoojus
standard enthalpy of formation
elektron

elektronkiht	2, 8, 18, 32, 30, 8, 2

valentselektron	2 ⓘ

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

oksüdatsiooniaste	2, 3
elektronegatiivsus	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
kolmikpunkt
Välimus
värvus	Colorless #ffffff #b31fba #b31fba
Välimus
Murdumisnäitaja
thermodynamic material property
Thermal Conductivity
soojuspaisumine
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
Elektrijuhtivus
Eritakistus
Ülijuhtivus
Magnetism
type
Magnetiline vastuvõtlikkus (Mass)
Magnetiline vastuvõtlikkus (Molar)
Magnetiline vastuvõtlikkus (Volume)
magnetic ordering
Curie punkt
Néel temperature
struktuur
Crystal Structure	()
lattice constant
Lattice Angles
mechanical property
kõvadus
Ruumpaisumismoodul
Nihkeelastsusmoodul
Normaalelastsusmoodul
Poissoni tegur
heli kiirus
Klassifitseerimine
Category	Actinides, Actinides
CAS Group
IUPAC Group
Glawe Number	44
Mendeleev Number	36
Pettifor Number	37
Geochemical Class
Goldschmidt classification	synthetic

teine

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

Isotopes of Fermium

Stable Isotopes	0
Unstable Isotopes	20
Natural Isotopes	0

²⁴¹Fm

massiarv	241
neutron number	141
Relative Atomic Mass	241,074311 ± 0,000322 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	730 ± 60 us
spinn	5/2
nuclear quadrupole moment
avastamise aeg	2008
parity	+

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

²⁴²Fm

massiarv	242
neutron number	142
Relative Atomic Mass	242,07343 ± 0,00043 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	800 ± 200 us
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1975
parity	+

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

²⁴³Fm

massiarv	243
neutron number	143
Relative Atomic Mass	243,074414 ± 0,00014 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	231 ± 9 ms
spinn	7/2
nuclear quadrupole moment
avastamise aeg	1981
parity	-

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

²⁴⁴Fm

massiarv	244
neutron number	144
Relative Atomic Mass	244,074036 ± 0,000216 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	3,12 ± 0,08 ms
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1967
parity	+

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

²⁴⁵Fm

massiarv	245
neutron number	145
Relative Atomic Mass	245,075354 ± 0,00021 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	4,2 ± 1,3 s
spinn	1/2
nuclear quadrupole moment	0
avastamise aeg	1967
parity	+

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

²⁴⁶Fm

massiarv	246
neutron number	146
Relative Atomic Mass	246,075353334 ± 0,000014675 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	1,54 ± 0,04 s
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1966
parity	+

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

²⁴⁷Fm

massiarv	247
neutron number	147
Relative Atomic Mass	247,076944 ± 0,000194 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	31 ± 1 s
spinn	7/2
nuclear quadrupole moment
avastamise aeg	1967
parity	+

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

²⁴⁸Fm

massiarv	248
neutron number	148
Relative Atomic Mass	248,077185451 ± 0,000009122 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	34,5 ± 1,2 s
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1958
parity	+

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

²⁴⁹Fm

massiarv	249
neutron number	149
Relative Atomic Mass	249,078926042 ± 0,000006668 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	1,6 ± 0,1 m
spinn	7/2
nuclear quadrupole moment
avastamise aeg	1960
parity	+

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

²⁵⁰Fm

massiarv	250
neutron number	150
Relative Atomic Mass	250,079519765 ± 0,000008468 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	31 ± 1,1 m
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1954
parity	+

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

²⁵¹Fm

massiarv	251
neutron number	151
Relative Atomic Mass	251,08154513 ± 0,000015342 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	5,3 ± 0,08 h
spinn	9/2
nuclear quadrupole moment
avastamise aeg	1957
parity	-

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

²⁵²Fm

massiarv	252
neutron number	152
Relative Atomic Mass	252,082466019 ± 0,000005604 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	25,39 ± 0,04 h
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1956
parity	+

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

²⁵³Fm

massiarv	253
neutron number	153
Relative Atomic Mass	253,085180945 ± 0,000001662 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	3 ± 0,12 d
spinn	1/2
nuclear quadrupole moment	0
avastamise aeg	1957
parity	+

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

²⁵⁴Fm

massiarv	254
neutron number	154
Relative Atomic Mass	254,086852424 ± 0,000001978 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	3,24 ± 0,002 h
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1954
parity	+

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

²⁵⁵Fm

massiarv	255
neutron number	155
Relative Atomic Mass	255,089963495 ± 0,000004223 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	20,07 ± 0,07 h
spinn	7/2
nuclear quadrupole moment
avastamise aeg	1954
parity	+

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

²⁵⁶Fm

massiarv	256
neutron number	156
Relative Atomic Mass	256,091771699 ± 0,000003241 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	157,1 ± 1,3 m
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1955
parity	+

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

²⁵⁷Fm

massiarv	257
neutron number	157
Relative Atomic Mass	257,095105419 ± 0,000004669 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	100,5 ± 0,2 d
spinn	9/2
nuclear quadrupole moment
avastamise aeg	1964
parity	+

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

²⁵⁸Fm

massiarv	258
neutron number	158
Relative Atomic Mass	258,097077 ± 0,000215 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	370 ± 14 us
spinn	0
nuclear quadrupole moment	0
avastamise aeg	1971
parity	+

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

²⁵⁹Fm

massiarv	259
neutron number	159
Relative Atomic Mass	259,100596 ± 0,000304 Da
g-factor
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg	1,5 ± 0,2 s
spinn
nuclear quadrupole moment
avastamise aeg	1980
parity

decay mode	Intensiivsus
SF (spontaneous fission)	100%

²⁶⁰Fm

massiarv	260
neutron number	160
Relative Atomic Mass	260,102809 ± 0,000467 Da
g-factor	0
natural abundance
radioaktiivsus	☢️ radioactive element
Poolestusaeg
spinn	0
nuclear quadrupole moment	0
avastamise aeg
parity	+

decay mode	Intensiivsus
SF (spontaneous fission)

ajalugu

leiutaja või avastaja	Argonne, Los Alamos, U of Calif
location of discovery	United States
avastamise aeg	1953
etümoloogia	Named in honor of the scientist Enrico Fermi.
pronunciation	FER-mi-em (inglise)

allikas

Abundance
Abundance in Earth's crust
natural abundance (ookean)
natural abundance (Inimkeha)	0 %
natural abundance (meteoorkeha)	0 %
natural abundance (Päike)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Fermium on ChemicalAid

Australian Educational Vocabulary ID	scot/3519
CAS Registry Number	7440-72-4
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	/m/025rqck
GND	4490995-0
Gran Enciclopèdia Catalana ID	0108657
Great Russian Encyclopedia Online ID	4709674
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

Fermium (Fm)

Füüsikalised Omadused

Keemilised Omadused

teine

Isotopes of Fermium

241Fm

242Fm

243Fm

244Fm

245Fm

246Fm

247Fm

248Fm

249Fm

250Fm

251Fm

252Fm

253Fm

254Fm

255Fm

256Fm

257Fm

258Fm

259Fm

260Fm

ajalugu

allikas

Nuclear Screening Constants

²⁴¹Fm

²⁴²Fm

²⁴³Fm

²⁴⁴Fm

²⁴⁵Fm

²⁴⁶Fm

²⁴⁷Fm

²⁴⁸Fm

²⁴⁹Fm

²⁵⁰Fm

²⁵¹Fm

²⁵²Fm

²⁵³Fm

²⁵⁴Fm

²⁵⁵Fm

²⁵⁶Fm

²⁵⁷Fm

²⁵⁸Fm

²⁵⁹Fm

²⁶⁰Fm