Americium (Am)

grundämne

Atomnummer	95
Atommassa	243
masstal	223

Grupp
Period	7
Block	f

Protoner	95 p⁺
Neutroner	128 n⁰
Electrons	95 e^-

Animated Bohrs atommodell of Am (Americium)

Egenskaper

fysisk egenskap
atomradie	175 pm 276 pm
molvolym	20,8 cm³/mol
kovalent radie	166 pm 135 pm 180 pm
Metallic Radius
ionic radius	121 pm 126 pm 131 pm 97,5 pm 109 pm 85 pm 95 pm 115,7 pm
Crystal Radius	135 pm 140 pm 145 pm 111,5 pm 123 pm 99 pm 109 pm 129,7 pm
Van der Waalsradie	244 pm 338,1 pm
densitet	12 g/cm³
energi
proton affinity
Elektronaffinitet
joniseringsenergi	5,9738 eV/particle 11,7 eV/particle 21,7 eV/particle 36,8 eV/particle 50 eV/particle 67,9 eV/particle 95 eV/particle 110 eV/particle 126 eV/particle 141 eV/particle 162 eV/particle 184 eV/particle 206 eV/particle 225 eV/particle 242 eV/particle 284 eV/particle 305 eV/particle 424 eV/particle 451 eV/particle 481 eV/particle 511 eV/particle 541 eV/particle 571 eV/particle 616 eV/particle 646 eV/particle 680 eV/particle 711 eV/particle 860 eV/particle 900 eV/particle 940 eV/particle 980 eV/particle 1 090 eV/particle 1 130 eV/particle 1 240 eV/particle 1 280 eV/particle 1 410 eV/particle 1 490 eV/particle 1 570 eV/particle 1 650 eV/particle 1 740 eV/particle 1 820 eV/particle 1 900 eV/particle 1 980 eV/particle 2 070 eV/particle 2 160 eV/particle 2 240 eV/particle 2 320 eV/particle 2 410 eV/particle 2 000 eV/particle 2 874 eV/particle 2 946 eV/particle 3 021 eV/particle 3 101 eV/particle 3 178 eV/particle 3 251 eV/particle 3 402 eV/particle 3 479 eV/particle 3 563 eV/particle 3 641 eV/particle 3 956 eV/particle 4 033 eV/particle 4 115 eV/particle 4 191 eV/particle 4 642 eV/particle 4 733 eV/particle 4 960 eV/particle 5 050 eV/particle 8 040 eV/particle 8 210 eV/particle 8 400 eV/particle 8 590 eV/particle 8 770 eV/particle 8 950 eV/particle 9 380 eV/particle 9 560 eV/particle 9 770 eV/particle 9 960 eV/particle 10 490 eV/particle 10 650 eV/particle 10 830 eV/particle 11 000 eV/particle 12 400 eV/particle 12 600 eV/particle 13 000 eV/particle 13 190 eV/particle 27 110 eV/particle 27 550 eV/particle 28 040 eV/particle 28 500 eV/particle 33 700 eV/particle 34 300 eV/particle 35 100 eV/particle 35 549,4 eV/particle 139 769,5 eV/particle 142 161 eV/particle

ångbildningsvärme	238,5 kJ/mol
smältvärme	10 kJ/mol
Bildningsentalpi	284 kJ/mol
Electrons
electron shell	2, 8, 18, 32, 25, 8, 2

valenselektron	2

elektronkonfiguration	[Rn] 5f⁷ 7s²

oxidationstal	2, 3, 4, 5, 6, 7
elektronegativitet	0.17194
Electrophilicity
Phases
aggregationstillstånd	Fast
Gas Phase
Kokpunkt
Smältpunkt	1 449,15 K
critical pressure
critical temperature
trippelpunkt
Visual
färg	Silver #ffffff #545cf2 #545cf2
appearance	silvery white
Brytningsindex
materialegenskap
Värmeledningsförmåga
termisk expansion
molar heat capacity
Specifik värmekapacitet
heat capacity ratio
electrical properties
type
elektrisk konduktivitet
resistivitet
supraledare	0,6 K
magnetism
type	paramagnetic
magnetisk susceptibilitet (Mass)	0,0000000515 m³/Kg
magnetisk susceptibilitet (Molar)	0,00000001251 m³/mol
magnetisk susceptibilitet (Volume)	0,000704
magnetic ordering
Curiepunkten
Néel temperature
Structure
Kristallstruktur	Enkelt hexagonalt ()
Gitterkonstant
Lattice Angles	π/2, π/2, 2 π/3
mekanisk materialegenskap
hårdhet
Kompressibilitet
skjuvmodul
Young's modulus
Poissons konstant
ljudhastighet
klassificering
Kategori	Aktinider, Actinides
CAS Group
IUPAC Group
Glawe Number	39
Mendeleev Number	26
Pettifor Number	42
Geochemical Class
Goldschmidt classification	synthetic
övrigt
Gas Basicity
Dipole Polarizability	131 ± 25 a₀
C6 Dispersion Coefficient
Allotropes
Träffyta	74
Neutron Mass Absorption
kvanttal	8S7/2
rymdgrupp	194 (P63/mmc)

Americiumisotoper

Stabila isotoper	0
Instabila isotoper	27
Radioactive Isotopes	27

²²³Am

natural abundance	Radioactive ☢️
relative atomic mass	223,04584 ± 0,000322 Da
masstal	223
g-factor
Halveringstid	10 ± 9 ms
Spinn	9/2
nuclear quadrupole moment
upptäcktsdatum	2015
Paritet	-

²²³Am Decay Modes

decay mode	Intensitet
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	%

²²⁴Am

natural abundance	Radioactive ☢️
relative atomic mass	224,046442 ± 0,000429 Da
masstal	224
g-factor
Halveringstid
Spinn
nuclear quadrupole moment
upptäcktsdatum
Paritet

²²⁴Am Decay Modes

decay mode	Intensitet
α (α emission)	%
SF (spontaneous fission)	%

²²⁵Am

natural abundance	Radioactive ☢️
relative atomic mass	225,045508 ± 0,000429 Da
masstal	225
g-factor
Halveringstid
Spinn	9/2
nuclear quadrupole moment
upptäcktsdatum
Paritet	-

²²⁵Am Decay Modes

decay mode	Intensitet
α (α emission)	%
SF (spontaneous fission)	%

²²⁶Am

natural abundance	Radioactive ☢️
relative atomic mass	226,04613 ± 0,000322 Da
masstal	226
g-factor
Halveringstid
Spinn
nuclear quadrupole moment
upptäcktsdatum
Paritet

²²⁶Am Decay Modes

decay mode	Intensitet
α (α emission)	%
SF (spontaneous fission)	%

²²⁷Am

natural abundance	Radioactive ☢️
relative atomic mass	227,045282 ± 0,000215 Da
masstal	227
g-factor
Halveringstid
Spinn	9/2
nuclear quadrupole moment
upptäcktsdatum
Paritet	-

²²⁷Am Decay Modes

decay mode	Intensitet
α (α emission)	%
SF (spontaneous fission)	%

²²⁸Am

natural abundance	Radioactive ☢️
relative atomic mass	228,046001 ± 0,000215 Da
masstal	228
g-factor
Halveringstid
Spinn
nuclear quadrupole moment
upptäcktsdatum
Paritet

²²⁸Am Decay Modes

decay mode	Intensitet
α (α emission)	%
SF (spontaneous fission)	%

²²⁹Am

natural abundance	Radioactive ☢️
relative atomic mass	229,045282534 ± 0,000114169 Da
masstal	229
g-factor
Halveringstid	1,8 ± 1,5 s
Spinn	5/2
nuclear quadrupole moment
upptäcktsdatum	2015
Paritet	-

²²⁹Am Decay Modes

decay mode	Intensitet
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	%

²³⁰Am

natural abundance	Radioactive ☢️
relative atomic mass	230,046025 ± 0,000153 Da
masstal	230
g-factor
Halveringstid	40 ± 9 s
Spinn	1
nuclear quadrupole moment
upptäcktsdatum	2003
Paritet	-

²³⁰Am Decay Modes

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ SF (β⁺-delayed fission)	30%

²³¹Am

natural abundance	Radioactive ☢️
relative atomic mass	231,045529 ± 0,000322 Da
masstal	231
g-factor
Halveringstid
Spinn	5/2
nuclear quadrupole moment
upptäcktsdatum
Paritet	-

²³¹Am Decay Modes

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

²³²Am

natural abundance	Radioactive ☢️
relative atomic mass	232,046613 ± 0,000322 Da
masstal	232
g-factor
Halveringstid	1,31 ± 0,04 m
Spinn	1
nuclear quadrupole moment
upptäcktsdatum	1967
Paritet	-

²³²Am Decay Modes

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	97%
α (α emission)	%
β⁺ SF (β⁺-delayed fission)	0.069%

²³³Am

natural abundance	Radioactive ☢️
relative atomic mass	233,046468 ± 0,000123 Da
masstal	233
g-factor
Halveringstid	3,2 ± 0,8 m
Spinn	5/2
nuclear quadrupole moment
upptäcktsdatum	2000
Paritet	-

²³³Am Decay Modes

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	%
α (α emission)	4.5%

²³⁴Am

natural abundance	Radioactive ☢️
relative atomic mass	234,047731 ± 0,000172 Da
masstal	234
g-factor	0
Halveringstid	2,32 ± 0,08 m
Spinn	0
nuclear quadrupole moment	0
upptäcktsdatum	1967
Paritet	-

²³⁴Am Decay Modes

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	0.039%
β⁺ SF (β⁺-delayed fission)	0.0066%

²³⁵Am

natural abundance	Radioactive ☢️
relative atomic mass	235,047906478 ± 0,000056661 Da
masstal	235
g-factor
Halveringstid	10,3 ± 0,6 m
Spinn	5/2
nuclear quadrupole moment
upptäcktsdatum	1996
Paritet	-

²³⁵Am Decay Modes

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	99.6%
α (α emission)	0.4%

²³⁶Am

natural abundance	Radioactive ☢️
relative atomic mass	236,049427 ± 0,000127 Da
masstal	236
g-factor
Halveringstid	3,6 ± 0,1 m
Spinn	5
nuclear quadrupole moment
upptäcktsdatum	1998
Paritet	-

²³⁶Am Decay Modes

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	4%

²³⁷Am

natural abundance	Radioactive ☢️
relative atomic mass	237,049995 ± 0,000064 Da
masstal	237
g-factor
Halveringstid	73,6 ± 0,8 m
Spinn	5/2
nuclear quadrupole moment
upptäcktsdatum	1970
Paritet	-

²³⁷Am Decay Modes

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	99.975%
α (α emission)	0.025%

²³⁸Am

natural abundance	Radioactive ☢️
relative atomic mass	238,051982531 ± 0,000063243 Da
masstal	238
g-factor
Halveringstid	98 ± 3 m
Spinn	1
nuclear quadrupole moment
upptäcktsdatum	1950
Paritet	+

²³⁸Am Decay Modes

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	1%

²³⁹Am

natural abundance	Radioactive ☢️
relative atomic mass	239,053022729 ± 0,000002127 Da
masstal	239
g-factor
Halveringstid	11,9 ± 0,1 h
Spinn	5/2
nuclear quadrupole moment
upptäcktsdatum	1949
Paritet	-

²³⁹Am Decay Modes

decay mode	Intensitet
ϵ (electron capture)	99.99%
α (α emission)	0.01%

²⁴⁰Am

natural abundance	Radioactive ☢️
relative atomic mass	240,055298374 ± 0,000014849 Da
masstal	240
g-factor
Halveringstid	50,8 ± 0,3 h
Spinn	3
nuclear quadrupole moment
upptäcktsdatum	1949
Paritet	-

²⁴⁰Am Decay Modes

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	1.9%

²⁴¹Am

natural abundance	Radioactive ☢️
relative atomic mass	241,056827343 ± 0,000001195 Da
masstal	241
g-factor	0,64 ± 0,004
Halveringstid	432,6 ± 0,6 y
Spinn	5/2
nuclear quadrupole moment	4,34 ± 0,05
upptäcktsdatum	1949
Paritet	-

²⁴¹Am Decay Modes

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)	3.6%

²⁴²Am

natural abundance	Radioactive ☢️
relative atomic mass	242,059547358 ± 0,000001199 Da
masstal	242
g-factor	0,3854 ± 0,0017
Halveringstid	16,02 ± 0,02 h
Spinn	1
nuclear quadrupole moment	−2,4 ± 0,4
upptäcktsdatum	1949
Paritet	-

²⁴²Am Decay Modes

decay mode	Intensitet
β⁻ (β⁻ decay)	82.7%
ϵ (electron capture)	17.3%

²⁴³Am

natural abundance	Radioactive ☢️
relative atomic mass	243,061379889 ± 0,00000149 Da
masstal	243
g-factor	0,608 ± 0,004
Halveringstid	7,35 ± 0,009 ky
Spinn	5/2
nuclear quadrupole moment	4,32 ± 0,06
upptäcktsdatum	1950
Paritet	-

²⁴³Am Decay Modes

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)	3.7%

²⁴⁴Am

natural abundance	Radioactive ☢️
relative atomic mass	244,064282892 ± 0,0000016 Da
masstal	244
g-factor
Halveringstid	10,01 ± 0,03 h
Spinn	6
nuclear quadrupole moment
upptäcktsdatum	1950
Paritet	-

²⁴⁴Am Decay Modes

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁴⁵Am

natural abundance	Radioactive ☢️
relative atomic mass	245,066452827 ± 0,000002024 Da
masstal	245
g-factor
Halveringstid	2,05 ± 0,01 h
Spinn	5/2
nuclear quadrupole moment
upptäcktsdatum	1955
Paritet	+

²⁴⁵Am Decay Modes

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁴⁶Am

natural abundance	Radioactive ☢️
relative atomic mass	246,069774 ± 0,000019 Da
masstal	246
g-factor
Halveringstid	39 ± 3 m
Spinn	7
nuclear quadrupole moment
upptäcktsdatum	1955
Paritet	-

²⁴⁶Am Decay Modes

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁴⁷Am

natural abundance	Radioactive ☢️
relative atomic mass	247,072092 ± 0,000107 Da
masstal	247
g-factor
Halveringstid	23 ± 1,3 m
Spinn	5/2
nuclear quadrupole moment
upptäcktsdatum	1967
Paritet

²⁴⁷Am Decay Modes

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁴⁸Am

natural abundance	Radioactive ☢️
relative atomic mass	248,075752 ± 0,000215 Da
masstal	248
g-factor
Halveringstid
Spinn	3
nuclear quadrupole moment
upptäcktsdatum
Paritet	+

²⁴⁸Am Decay Modes

decay mode	Intensitet
β⁻ (β⁻ decay)	%

²⁴⁹Am

natural abundance	Radioactive ☢️
relative atomic mass	249,07848 ± 0,00032 Da
masstal	249
g-factor
Halveringstid
Spinn	5/2
nuclear quadrupole moment
upptäcktsdatum
Paritet

²⁴⁹Am Decay Modes

decay mode	Intensitet
β⁻ (β⁻ decay)	%

historia

upptäckare eller uppfinnare	G.T.Seaborg, R.A.James, L.O.Morgan, A.Ghiorso
fyndplats	United States
upptäcktsdatum	1945
etymologi	Named for the American continent, by analogy with europium.
uttal	am-er-ISH-i-em (engelska)

Sources

Förekomst
Abundance in Earth's crust
Abundance in Oceans
Abundance in Human Body	0 %
Abundance in Meteor	0 %
Abundance in Sun	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Americium on ChemicalAid

Australian Educational Vocabulary-ID	scot/1091
CAB ID	7535
CAS-nummer	7440-35-9
ChEBI-ID	33389
ChemSpider-ID	22405
DSSTOX compound identifier	DTXCID6047658
DSSTox substance ID	DTXSID3064693
Den Store Danske-ID	americium
Deutsche Nationalbibliotheks katalog-id-nummer	4191405-3
ECHA Substance Infocard ID	100.028.313
Elhuyar ZTH ID	020208
Enciclopedia Treccani	americio
Encyclopædia Britannica Online-ID	science/americium
Encyclopædia Universalis-ID	americium
Freebase-ID	/m/027sxty
InChI	InChI=1S/Am
InChIKey	LXQXZNRPTYVCNG-UHFFFAOYSA-N
J9U-ID	987007294067605171
KBpedia-ID	Americium
MeSH-ID	D000576
NDL-ID	00575178
OmegaWiki Definierad Betydelse	155847
OpenAlex-ID	C552554468
PDB ligand ID	AM
PDB struktur-ID	4ZHG
PubChem-ID (CID)	23966
Römpp online ID	RD-01-01920
Stora ryska encyklopedin-ID	1817972
Store norske leksikon-ID	americium
UNII	VW92PHU2UY
USGS Thesaurus ID	1392
Vikidia-ID (franska)	Américium
Zhongguo da baike quanshu-ID	220632
id-nummer i USA:s kongressbiblioteks katalog	sh85004443
synset-ID på WordNet 3.1	14652672-n

Americium (Am)

Egenskaper

Americiumisotoper

223Am

223Am Decay Modes

224Am

224Am Decay Modes

225Am

225Am Decay Modes

226Am

226Am Decay Modes

227Am

227Am Decay Modes

228Am

228Am Decay Modes

229Am

229Am Decay Modes

230Am

230Am Decay Modes

231Am

231Am Decay Modes

232Am

232Am Decay Modes

233Am

233Am Decay Modes

234Am

234Am Decay Modes

235Am

235Am Decay Modes

236Am

236Am Decay Modes

237Am

237Am Decay Modes

238Am

238Am Decay Modes

239Am

239Am Decay Modes

240Am

240Am Decay Modes

241Am

241Am Decay Modes

242Am

242Am Decay Modes

243Am

243Am Decay Modes

244Am

244Am Decay Modes

245Am

245Am Decay Modes

246Am

246Am Decay Modes

247Am

247Am Decay Modes

248Am

248Am Decay Modes

249Am

249Am Decay Modes

historia

Sources

Nuclear Screening Constants

²²³Am

²²³Am Decay Modes

²²⁴Am

²²⁴Am Decay Modes

²²⁵Am

²²⁵Am Decay Modes

²²⁶Am

²²⁶Am Decay Modes

²²⁷Am

²²⁷Am Decay Modes

²²⁸Am

²²⁸Am Decay Modes

²²⁹Am

²²⁹Am Decay Modes

²³⁰Am

²³⁰Am Decay Modes

²³¹Am

²³¹Am Decay Modes

²³²Am

²³²Am Decay Modes

²³³Am

²³³Am Decay Modes

²³⁴Am

²³⁴Am Decay Modes

²³⁵Am

²³⁵Am Decay Modes

²³⁶Am

²³⁶Am Decay Modes

²³⁷Am

²³⁷Am Decay Modes

²³⁸Am

²³⁸Am Decay Modes

²³⁹Am

²³⁹Am Decay Modes

²⁴⁰Am

²⁴⁰Am Decay Modes

²⁴¹Am

²⁴¹Am Decay Modes

²⁴²Am

²⁴²Am Decay Modes

²⁴³Am

²⁴³Am Decay Modes

²⁴⁴Am

²⁴⁴Am Decay Modes

²⁴⁵Am

²⁴⁵Am Decay Modes

²⁴⁶Am

²⁴⁶Am Decay Modes

²⁴⁷Am

²⁴⁷Am Decay Modes

²⁴⁸Am

²⁴⁸Am Decay Modes

²⁴⁹Am

²⁴⁹Am Decay Modes