Amerikium

Amerikium (Am)

chemical element with the atomic number of 95
Atomic Number95
Atomic Weight243
Massagetal223
Group
Period7
Blockf
proton95 p+
neutron128 n0
elektron95 e-
Animated Bohr model of Am (Amerikium)

Physical Property

Atoomradius
175 pm
molar volume
Covalent Radius
166 pm
Metallic Radius
Ioonradius
121 pm
Crystal Radius
135 pm
Van der Waals radius
244 pm
density
Atomic Radii Of The Elements: Amerikium0102030405060708090100110120130140150160170180190200210220230240250pmAtoomradiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

energie
proton affinity
electron affinity
ionization energy
ionization energy of Am (Amerikium)
Verdampingswarmte
238,5 kJ/mol
smeltingswarmte
Vormingsentalpie
284 kJ/mol
elektron
Elektronskil2, 8, 18, 32, 25, 8, 2
Bohr model: Am (Amerikium)
Valenselektrone2
Lewisteorie: Am (Amerikium)
elektronkonfigurasie[Rn] 5f7 7s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 5f7 7s2
Enhanced Bohr model of Am (Amerikium)
Orbital Diagram of Am (Amerikium)
Oksidasietoestand2, 3, 4, 5, 6, 7
Elektronegatiwiteit
Electrophilicity Index
fundamental state of matter
phase of matterSolid
gaseous state of matter
Boiling Point
Melting Point
1 449,15 K
critical pressure
critical temperature
triple point
appearance
kleur
Silver
appearancesilvery white
Brekingsindeks
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
Geleidingsvermoë
Elektriese resistiwiteit
superconductivity
0,6 K
Magnetisme
typeparamagnetic
magnetic susceptibility (Mass)
0,0000000515 m³/Kg
magnetic susceptibility (Molar)
0,00000001251 m³/mol
magnetic susceptibility (Volume)
0,000704
magnetic ordering
Curie temperature
Néel temperature
structure
Crystal StructureSimple Hexagonal ()
lattice constant
Lattice Anglesπ/2, π/2, 2 π/3
mechanical property
hardness
Massamodulus
Skuifmodulus
Young se modulus
Poisson se verhouding
Spoed van klank
classification
CategoryActinides, Actinides
CAS Group
IUPAC Group
Glawe Number39
Mendeleev Number26
Pettifor Number42
Geochemical Class
Goldschmidt classificationsynthetic

other

Gas Basicity
polarizability
131 ± 25 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
74
Neutron Mass Absorption
quantum number8S7/2
Ruimtegroep194 (P63/mmc)

Isotopes of Americium

Stable Isotopes0
Unstable Isotopes27
Natural Isotopes0

223Am

Massagetal223
neutron number128
relative atomic mass
223,04584 ± 0,000322 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
10 ± 9 ms
spin9/2
nuclear quadrupole moment
ontdekkingsdatum2015
parity-

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

224Am

Massagetal224
neutron number129
relative atomic mass
224,046442 ± 0,000429 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin
nuclear quadrupole moment
ontdekkingsdatum
parity

decay modeintensity
α (α emission)
SF (spontaneous fission)

225Am

Massagetal225
neutron number130
relative atomic mass
225,045508 ± 0,000429 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin9/2
nuclear quadrupole moment
ontdekkingsdatum
parity-

decay modeintensity
α (α emission)
SF (spontaneous fission)

226Am

Massagetal226
neutron number131
relative atomic mass
226,04613 ± 0,000322 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin
nuclear quadrupole moment
ontdekkingsdatum
parity

decay modeintensity
α (α emission)
SF (spontaneous fission)

227Am

Massagetal227
neutron number132
relative atomic mass
227,045282 ± 0,000215 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin9/2
nuclear quadrupole moment
ontdekkingsdatum
parity-

decay modeintensity
α (α emission)
SF (spontaneous fission)

228Am

Massagetal228
neutron number133
relative atomic mass
228,046001 ± 0,000215 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin
nuclear quadrupole moment
ontdekkingsdatum
parity

decay modeintensity
α (α emission)
SF (spontaneous fission)

229Am

Massagetal229
neutron number134
relative atomic mass
229,045282534 ± 0,000114169 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1,8 ± 1,5 s
spin5/2
nuclear quadrupole moment
ontdekkingsdatum2015
parity-

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

230Am

Massagetal230
neutron number135
relative atomic mass
230,046025 ± 0,000153 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
40 ± 9 s
spin1
nuclear quadrupole moment
ontdekkingsdatum2003
parity-

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

231Am

Massagetal231
neutron number136
relative atomic mass
231,045529 ± 0,000322 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin5/2
nuclear quadrupole moment
ontdekkingsdatum
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)
α (α emission)

232Am

Massagetal232
neutron number137
relative atomic mass
232,046613 ± 0,000322 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1,31 ± 0,04 m
spin1
nuclear quadrupole moment
ontdekkingsdatum1967
parity-

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

233Am

Massagetal233
neutron number138
relative atomic mass
233,046468 ± 0,000123 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
3,2 ± 0,8 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum2000
parity-

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

234Am

Massagetal234
neutron number139
relative atomic mass
234,047731 ± 0,000172 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
2,32 ± 0,08 m
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1967
parity-

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

235Am

Massagetal235
neutron number140
relative atomic mass
235,047906478 ± 0,000056661 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
10,3 ± 0,6 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1996
parity-

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

236Am

Massagetal236
neutron number141
relative atomic mass
236,049427 ± 0,000127 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
3,6 ± 0,1 m
spin5
nuclear quadrupole moment
ontdekkingsdatum1998
parity-

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

237Am

Massagetal237
neutron number142
relative atomic mass
237,049995 ± 0,000064 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
73,6 ± 0,8 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1970
parity-

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

238Am

Massagetal238
neutron number143
relative atomic mass
238,051982531 ± 0,000063243 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
98 ± 3 m
spin1
nuclear quadrupole moment
ontdekkingsdatum1950
parity+

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

239Am

Massagetal239
neutron number144
relative atomic mass
239,053022729 ± 0,000002127 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
11,9 ± 0,1 h
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1949
parity-

decay modeintensity
ϵ (electron capture)99.99%
α (α emission)0.01%

240Am

Massagetal240
neutron number145
relative atomic mass
240,055298374 ± 0,000014849 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
50,8 ± 0,3 h
spin3
nuclear quadrupole moment
ontdekkingsdatum1949
parity-

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

241Am

Massagetal241
neutron number146
relative atomic mass
241,056827343 ± 0,000001195 Da
g-factor
0,64 ± 0,004
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
432,6 ± 0,6 y
spin5/2
nuclear quadrupole moment
4,34 ± 0,05
ontdekkingsdatum1949
parity-

decay modeintensity
α (α emission)100%
SF (spontaneous fission)3.6%

242Am

Massagetal242
neutron number147
relative atomic mass
242,059547358 ± 0,000001199 Da
g-factor
0,3854 ± 0,0017
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
16,02 ± 0,02 h
spin1
nuclear quadrupole moment
-2,4 ± 0,4
ontdekkingsdatum1949
parity-

decay modeintensity
β (β decay)82.7%
ϵ (electron capture)17.3%

243Am

Massagetal243
neutron number148
relative atomic mass
243,061379889 ± 0,00000149 Da
g-factor
0,608 ± 0,004
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
7,35 ± 0,009 ky
spin5/2
nuclear quadrupole moment
4,32 ± 0,06
ontdekkingsdatum1950
parity-

decay modeintensity
α (α emission)100%
SF (spontaneous fission)3.7%

244Am

Massagetal244
neutron number149
relative atomic mass
244,064282892 ± 0,0000016 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
10,01 ± 0,03 h
spin6
nuclear quadrupole moment
ontdekkingsdatum1950
parity-

decay modeintensity
β (β decay)100%

245Am

Massagetal245
neutron number150
relative atomic mass
245,066452827 ± 0,000002024 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
2,05 ± 0,01 h
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1955
parity+

decay modeintensity
β (β decay)100%

246Am

Massagetal246
neutron number151
relative atomic mass
246,069774 ± 0,000019 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
39 ± 3 m
spin7
nuclear quadrupole moment
ontdekkingsdatum1955
parity-

decay modeintensity
β (β decay)100%

247Am

Massagetal247
neutron number152
relative atomic mass
247,072092 ± 0,000107 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
23 ± 1,3 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1967
parity

decay modeintensity
β (β decay)100%

248Am

Massagetal248
neutron number153
relative atomic mass
248,075752 ± 0,000215 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin3
nuclear quadrupole moment
ontdekkingsdatum
parity+

decay modeintensity
β (β decay)

249Am

Massagetal249
neutron number154
relative atomic mass
249,07848 ± 0,00032 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin5/2
nuclear quadrupole moment
ontdekkingsdatum
parity

decay modeintensity
β (β decay)
Americium microscope

geskiedenis

Ontdek deurG.T.Seaborg, R.A.James, L.O.Morgan, A.Ghiorso
ligging van ontdekkingUnited States
ontdekkingsdatum1945
etimologieNamed for the American continent, by analogy with europium.
uitspraakam-er-ISH-i-em (Engels)

source

Abundance
Abundance in Earth's crust
natural abundance (oseaan)
natural abundance (human body)
0 %
natural abundance (Meteoroïde)
0 %
natural abundance (Son)
0 %
Abundance in Universe
0 %

Nuclear Screening Constants