Americij (Am)

chemical element with the atomic number of 95

Atomski broj	95
Relativna atomska masa	243
Maseni broj	223

Skupina
Perioda	7
Blok	f

proton	95 p⁺
neutron	128 n⁰
elektron	95 e^-

Animated Bohrov model atoma of Am (Americij)

Physical Property

Atomski Radijus	175 pm 276 pm
Molni volumen	20,8 cm³/mol
Kovalentni Radijus	166 pm 135 pm 180 pm
Metallic Radius
Ionski radijus	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 Waals radius	244 pm 338,1 pm
gustoća	12 g/cm³

Kemijsko Svojstvo

{ERROR}

energija

proton affinity
Elektronski afinitet
ionization energy	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

Toplina isparivanja	238,5 kJ/mol
toplina taljenja	10 kJ/mol
standard enthalpy of formation	284 kJ/mol
elektron

Elektronska ljuska	2, 8, 18, 32, 25, 8, 2

valence electron	2 ⓘ

electron configuration	[Rn] 5f⁷ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f⁷ 7s²

Oksidacijski broj	2, 3, 4, 5, 6, 7
Elektronegativnost	0.17194
Electrophilicity Index
fundamental state of matter

agregatno stanje
gaseous state of matter
Vrelište
Talište	1.449,15 K
critical pressure
critical temperature
Trojna točka
appearance
boja	Crna #ffffff #545cf2 #545cf2
appearance	silvery white
Indeks prelamanja
thermodynamic material property
Toplinska vodljivost
Toplinsko istezanje
molar heat capacity
Specifični toplinski kapacitet
heat capacity ratio
electrical properties
type
electrical conductivity
Električna otpornost i provodnost
Supravodljivost	0,6 K
Magnetizam
type	paramagnetic
Magnetna susceptibilnost (Mass)	0,0000000515 m³/Kg
Magnetna susceptibilnost (Molar)	0,00000001251 m³/mol
Magnetna susceptibilnost (Volume)	0,000704
magnetic ordering
Curieva temperatura
Néel temperature
struktura
Kristalna struktura	{ERROR}
lattice constant
Lattice Angles	π/2, π/2, 2 π/3
mechanical property
Tvrdoća
bulk modulus
shear modulus
Youngov modul elastičnosti
Poissonov omjer
brzina zvuka
classification
Kategorija	Aktinoidi, Actinides
CAS Group
IUPAC Group
Glawe Number	39
Mendeleev Number	26
Pettifor Number	42
Geochemical Class
Goldschmidt classification	synthetic

other

Gas Basicity
polarizability	131 ± 25 a₀
C6 Dispersion Coefficient
allotrope
Nuklearni udarni presjek	74
Neutron Mass Absorption
Kvantni brojevi	8S7/2
space group	194 (P63/mmc)

Isotopes of Americium

Stabilni izotopi	0
Nestabilni izotopi	27
Natural Isotopes	0

²²³Am

Maseni broj	223
neutron number	128
Relativna Atomska Masa	223,04584 ± 0,000322 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	10 ± 9 ms
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	2015
Parnost	-

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

²²⁴Am

Maseni broj	224
neutron number	129
Relativna Atomska Masa	224,046442 ± 0,000429 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin
nuclear quadrupole moment
vrijeme otkrića ili izuma
Parnost

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

²²⁵Am

Maseni broj	225
neutron number	130
Relativna Atomska Masa	225,045508 ± 0,000429 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma
Parnost	-

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

²²⁶Am

Maseni broj	226
neutron number	131
Relativna Atomska Masa	226,04613 ± 0,000322 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin
nuclear quadrupole moment
vrijeme otkrića ili izuma
Parnost

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

²²⁷Am

Maseni broj	227
neutron number	132
Relativna Atomska Masa	227,045282 ± 0,000215 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	9/2
nuclear quadrupole moment
vrijeme otkrića ili izuma
Parnost	-

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

²²⁸Am

Maseni broj	228
neutron number	133
Relativna Atomska Masa	228,046001 ± 0,000215 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin
nuclear quadrupole moment
vrijeme otkrića ili izuma
Parnost

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

²²⁹Am

Maseni broj	229
neutron number	134
Relativna Atomska Masa	229,045282534 ± 0,000114169 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,8 ± 1,5 s
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	2015
Parnost	-

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

²³⁰Am

Maseni broj	230
neutron number	135
Relativna Atomska Masa	230,046025 ± 0,000153 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	40 ± 9 s
spin	1
nuclear quadrupole moment
vrijeme otkrića ili izuma	2003
Parnost	-

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

²³¹Am

Maseni broj	231
neutron number	136
Relativna Atomska Masa	231,045529 ± 0,000322 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma
Parnost	-

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

²³²Am

Maseni broj	232
neutron number	137
Relativna Atomska Masa	232,046613 ± 0,000322 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	1,31 ± 0,04 m
spin	1
nuclear quadrupole moment
vrijeme otkrića ili izuma	1967
Parnost	-

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

²³³Am

Maseni broj	233
neutron number	138
Relativna Atomska Masa	233,046468 ± 0,000123 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	3,2 ± 0,8 m
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	2000
Parnost	-

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

²³⁴Am

Maseni broj	234
neutron number	139
Relativna Atomska Masa	234,047731 ± 0,000172 Da
g-factor	0
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	2,32 ± 0,08 m
spin	0
nuclear quadrupole moment	0
vrijeme otkrića ili izuma	1967
Parnost	-

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

²³⁵Am

Maseni broj	235
neutron number	140
Relativna Atomska Masa	235,047906478 ± 0,000056661 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	10,3 ± 0,6 m
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1996
Parnost	-

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

²³⁶Am

Maseni broj	236
neutron number	141
Relativna Atomska Masa	236,049427 ± 0,000127 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	3,6 ± 0,1 m
spin	5
nuclear quadrupole moment
vrijeme otkrića ili izuma	1998
Parnost	-

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

²³⁷Am

Maseni broj	237
neutron number	142
Relativna Atomska Masa	237,049995 ± 0,000064 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	73,6 ± 0,8 m
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1970
Parnost	-

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

²³⁸Am

Maseni broj	238
neutron number	143
Relativna Atomska Masa	238,051982531 ± 0,000063243 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	98 ± 3 m
spin	1
nuclear quadrupole moment
vrijeme otkrića ili izuma	1950
Parnost	+

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

²³⁹Am

Maseni broj	239
neutron number	144
Relativna Atomska Masa	239,053022729 ± 0,000002127 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	11,9 ± 0,1 h
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1949
Parnost	-

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

²⁴⁰Am

Maseni broj	240
neutron number	145
Relativna Atomska Masa	240,055298374 ± 0,000014849 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	50,8 ± 0,3 h
spin	3
nuclear quadrupole moment
vrijeme otkrića ili izuma	1949
Parnost	-

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

²⁴¹Am

Maseni broj	241
neutron number	146
Relativna Atomska Masa	241,056827343 ± 0,000001195 Da
g-factor	0,64 ± 0,004
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	432,6 ± 0,6 y
spin	5/2
nuclear quadrupole moment	4,34 ± 0,05
vrijeme otkrića ili izuma	1949
Parnost	-

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

²⁴²Am

Maseni broj	242
neutron number	147
Relativna Atomska Masa	242,059547358 ± 0,000001199 Da
g-factor	0,3854 ± 0,0017
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	16,02 ± 0,02 h
spin	1
nuclear quadrupole moment	−2,4 ± 0,4
vrijeme otkrića ili izuma	1949
Parnost	-

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

²⁴³Am

Maseni broj	243
neutron number	148
Relativna Atomska Masa	243,061379889 ± 0,00000149 Da
g-factor	0,608 ± 0,004
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	7,35 ± 0,009 ky
spin	5/2
nuclear quadrupole moment	4,32 ± 0,06
vrijeme otkrića ili izuma	1950
Parnost	-

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

²⁴⁴Am

Maseni broj	244
neutron number	149
Relativna Atomska Masa	244,064282892 ± 0,0000016 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	10,01 ± 0,03 h
spin	6
nuclear quadrupole moment
vrijeme otkrića ili izuma	1950
Parnost	-

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

²⁴⁵Am

Maseni broj	245
neutron number	150
Relativna Atomska Masa	245,066452827 ± 0,000002024 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	2,05 ± 0,01 h
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1955
Parnost	+

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

²⁴⁶Am

Maseni broj	246
neutron number	151
Relativna Atomska Masa	246,069774 ± 0,000019 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	39 ± 3 m
spin	7
nuclear quadrupole moment
vrijeme otkrića ili izuma	1955
Parnost	-

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

²⁴⁷Am

Maseni broj	247
neutron number	152
Relativna Atomska Masa	247,072092 ± 0,000107 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada	23 ± 1,3 m
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma	1967
Parnost

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

²⁴⁸Am

Maseni broj	248
neutron number	153
Relativna Atomska Masa	248,075752 ± 0,000215 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	3
nuclear quadrupole moment
vrijeme otkrića ili izuma
Parnost	+

decay mode	intensity
β⁻ (β⁻ decay)

²⁴⁹Am

Maseni broj	249
neutron number	154
Relativna Atomska Masa	249,07848 ± 0,00032 Da
g-factor
natural abundance
radioaktivnost	☢️ radioactive element
Vrijeme poluraspada
spin	5/2
nuclear quadrupole moment
vrijeme otkrića ili izuma
Parnost

decay mode	intensity
β⁻ (β⁻ decay)

povijest

otkrio/izumio	G.T.Seaborg, R.A.James, L.O.Morgan, A.Ghiorso
location of discovery	United States
vrijeme otkrića ili izuma	1945
Etimologija	Named for the American continent, by analogy with europium.
pronunciation	am-er-ISH-i-em (engleski)

source

Obilnost
Zastupljenost u Zemljinoj kori
natural abundance (ocean)
natural abundance (tijelo)	0 %
natural abundance (meteoroid)	0 %
natural abundance (Sunce)	0 %
Zastupljenost u svemiru	0 %

Nuclear Screening Constants

Americij on ChemicalAid

Americij (Am)

Physical Property

Kemijsko Svojstvo

other

Isotopes of Americium

223Am

224Am

225Am

226Am

227Am

228Am

229Am

230Am

231Am

232Am

233Am

234Am

235Am

236Am

237Am

238Am

239Am

240Am

241Am

242Am

243Am

244Am

245Am

246Am

247Am

248Am

249Am

povijest

source

Nuclear Screening Constants

²²³Am

²²⁴Am

²²⁵Am

²²⁶Am

²²⁷Am

²²⁸Am

²²⁹Am

²³⁰Am

²³¹Am

²³²Am

²³³Am

²³⁴Am

²³⁵Am

²³⁶Am

²³⁷Am

²³⁸Am

²³⁹Am

²⁴⁰Am

²⁴¹Am

²⁴²Am

²⁴³Am

²⁴⁴Am

²⁴⁵Am

²⁴⁶Am

²⁴⁷Am

²⁴⁸Am

²⁴⁹Am