Americium

Americium (Am)

grundämne
Atomnummer95
Atommassa243
masstal223
Grupp
Period7
Blockf
Protoner95 p+
Neutroner128 n0
Electrons95 e-
Animated Bohrs atommodell of Am (Americium)

Egenskaper

fysisk egenskap
atomradie
175 pm
molvolym
kovalent radie
166 pm
Metallic Radius
ionic radius
121 pm
Crystal Radius
135 pm
Van der Waalsradie
244 pm
densitet
energi
proton affinity
Elektronaffinitet
joniseringsenergi
joniseringsenergi of Am (Americium)
ångbildningsvärme
238,5 kJ/mol
smältvärme
Bildningsentalpi
284 kJ/mol
Electrons
electron shell2, 8, 18, 32, 25, 8, 2
Bohrs atommodell: Am (Americium)
valenselektron2
Elektronformel: Am (Americium)
elektronkonfiguration[Rn] 5f7 7s2
Enhanced Bohrs atommodell of Am (Americium)
Orbital Diagram of Am (Americium)
oxidationstal2, 3, 4, 5, 6, 7
elektronegativitet
Electrophilicity
Phases
aggregationstillståndFast
Gas Phase
Kokpunkt
Smältpunkt
1 449,15 K
critical pressure
critical temperature
trippelpunkt
Visual
färg
Silver
appearancesilvery 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
typeparamagnetic
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
KristallstrukturEnkelt hexagonalt ()
Gitterkonstant
Lattice Anglesπ/2, π/2, 2 π/3
mekanisk materialegenskap
hårdhet
Kompressibilitet
skjuvmodul
Young's modulus
Poissons konstant
ljudhastighet
klassificering
KategoriAktinider, Actinides
CAS Group
IUPAC Group
Glawe Number39
Mendeleev Number26
Pettifor Number42
Geochemical Class
Goldschmidt classificationsynthetic
övrigt
Gas Basicity
Dipole Polarizability
131 ± 25 a₀
C6 Dispersion Coefficient
Allotropes
Träffyta
74
Neutron Mass Absorption
kvanttal8S7/2
rymdgrupp194 (P63/mmc)

Americiumisotoper

Stabila isotoper0
Instabila isotoper27
Radioactive Isotopes27

223Am

natural abundanceRadioactive ☢️
relative atomic mass
223,04584 ± 0,000322 Da
masstal223
g-factor
Halveringstid
10 ± 9 ms
Spinn9/2
nuclear quadrupole moment
upptäcktsdatum2015
Paritet-

223Am Decay Modes
decay modeIntensitet
α (α emission)100%
β+ (β+ decay; β+ = ϵ + e+)%

224Am

natural abundanceRadioactive ☢️
relative atomic mass
224,046442 ± 0,000429 Da
masstal224
g-factor
Halveringstid
Spinn
nuclear quadrupole moment
upptäcktsdatum
Paritet

224Am Decay Modes
decay modeIntensitet
α (α emission)%
SF (spontaneous fission)%

225Am

natural abundanceRadioactive ☢️
relative atomic mass
225,045508 ± 0,000429 Da
masstal225
g-factor
Halveringstid
Spinn9/2
nuclear quadrupole moment
upptäcktsdatum
Paritet-

225Am Decay Modes
decay modeIntensitet
α (α emission)%
SF (spontaneous fission)%

226Am

natural abundanceRadioactive ☢️
relative atomic mass
226,04613 ± 0,000322 Da
masstal226
g-factor
Halveringstid
Spinn
nuclear quadrupole moment
upptäcktsdatum
Paritet

226Am Decay Modes
decay modeIntensitet
α (α emission)%
SF (spontaneous fission)%

227Am

natural abundanceRadioactive ☢️
relative atomic mass
227,045282 ± 0,000215 Da
masstal227
g-factor
Halveringstid
Spinn9/2
nuclear quadrupole moment
upptäcktsdatum
Paritet-

227Am Decay Modes
decay modeIntensitet
α (α emission)%
SF (spontaneous fission)%

228Am

natural abundanceRadioactive ☢️
relative atomic mass
228,046001 ± 0,000215 Da
masstal228
g-factor
Halveringstid
Spinn
nuclear quadrupole moment
upptäcktsdatum
Paritet

228Am Decay Modes
decay modeIntensitet
α (α emission)%
SF (spontaneous fission)%

229Am

natural abundanceRadioactive ☢️
relative atomic mass
229,045282534 ± 0,000114169 Da
masstal229
g-factor
Halveringstid
1,8 ± 1,5 s
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum2015
Paritet-

229Am Decay Modes
decay modeIntensitet
α (α emission)100%
β+ (β+ decay; β+ = ϵ + e+)%

230Am

natural abundanceRadioactive ☢️
relative atomic mass
230,046025 ± 0,000153 Da
masstal230
g-factor
Halveringstid
40 ± 9 s
Spinn1
nuclear quadrupole moment
upptäcktsdatum2003
Paritet-

230Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)100%
β+ SF (β+-delayed fission)30%

231Am

natural abundanceRadioactive ☢️
relative atomic mass
231,045529 ± 0,000322 Da
masstal231
g-factor
Halveringstid
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum
Paritet-

231Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)%
α (α emission)%

232Am

natural abundanceRadioactive ☢️
relative atomic mass
232,046613 ± 0,000322 Da
masstal232
g-factor
Halveringstid
1,31 ± 0,04 m
Spinn1
nuclear quadrupole moment
upptäcktsdatum1967
Paritet-

232Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)97%
α (α emission)%
β+ SF (β+-delayed fission)0.069%

233Am

natural abundanceRadioactive ☢️
relative atomic mass
233,046468 ± 0,000123 Da
masstal233
g-factor
Halveringstid
3,2 ± 0,8 m
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum2000
Paritet-

233Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)%
α (α emission)4.5%

234Am

natural abundanceRadioactive ☢️
relative atomic mass
234,047731 ± 0,000172 Da
masstal234
g-factor
0
Halveringstid
2,32 ± 0,08 m
Spinn0
nuclear quadrupole moment
0
upptäcktsdatum1967
Paritet-

234Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)100%
α (α emission)0.039%
β+ SF (β+-delayed fission)0.0066%

235Am

natural abundanceRadioactive ☢️
relative atomic mass
235,047906478 ± 0,000056661 Da
masstal235
g-factor
Halveringstid
10,3 ± 0,6 m
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum1996
Paritet-

235Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)99.6%
α (α emission)0.4%

236Am

natural abundanceRadioactive ☢️
relative atomic mass
236,049427 ± 0,000127 Da
masstal236
g-factor
Halveringstid
3,6 ± 0,1 m
Spinn5
nuclear quadrupole moment
upptäcktsdatum1998
Paritet-

236Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)100%
α (α emission)4%

237Am

natural abundanceRadioactive ☢️
relative atomic mass
237,049995 ± 0,000064 Da
masstal237
g-factor
Halveringstid
73,6 ± 0,8 m
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum1970
Paritet-

237Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)99.975%
α (α emission)0.025%

238Am

natural abundanceRadioactive ☢️
relative atomic mass
238,051982531 ± 0,000063243 Da
masstal238
g-factor
Halveringstid
98 ± 3 m
Spinn1
nuclear quadrupole moment
upptäcktsdatum1950
Paritet+

238Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)100%
α (α emission)1%

239Am

natural abundanceRadioactive ☢️
relative atomic mass
239,053022729 ± 0,000002127 Da
masstal239
g-factor
Halveringstid
11,9 ± 0,1 h
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum1949
Paritet-

239Am Decay Modes
decay modeIntensitet
ϵ (electron capture)99.99%
α (α emission)0.01%

240Am

natural abundanceRadioactive ☢️
relative atomic mass
240,055298374 ± 0,000014849 Da
masstal240
g-factor
Halveringstid
50,8 ± 0,3 h
Spinn3
nuclear quadrupole moment
upptäcktsdatum1949
Paritet-

240Am Decay Modes
decay modeIntensitet
β+ (β+ decay; β+ = ϵ + e+)100%
α (α emission)1.9%

241Am

natural abundanceRadioactive ☢️
relative atomic mass
241,056827343 ± 0,000001195 Da
masstal241
g-factor
0,64 ± 0,004
Halveringstid
432,6 ± 0,6 y
Spinn5/2
nuclear quadrupole moment
4,34 ± 0,05
upptäcktsdatum1949
Paritet-

241Am Decay Modes
decay modeIntensitet
α (α emission)100%
SF (spontaneous fission)3.6%

242Am

natural abundanceRadioactive ☢️
relative atomic mass
242,059547358 ± 0,000001199 Da
masstal242
g-factor
0,3854 ± 0,0017
Halveringstid
16,02 ± 0,02 h
Spinn1
nuclear quadrupole moment
−2,4 ± 0,4
upptäcktsdatum1949
Paritet-

242Am Decay Modes
decay modeIntensitet
β (β decay)82.7%
ϵ (electron capture)17.3%

243Am

natural abundanceRadioactive ☢️
relative atomic mass
243,061379889 ± 0,00000149 Da
masstal243
g-factor
0,608 ± 0,004
Halveringstid
7,35 ± 0,009 ky
Spinn5/2
nuclear quadrupole moment
4,32 ± 0,06
upptäcktsdatum1950
Paritet-

243Am Decay Modes
decay modeIntensitet
α (α emission)100%
SF (spontaneous fission)3.7%

244Am

natural abundanceRadioactive ☢️
relative atomic mass
244,064282892 ± 0,0000016 Da
masstal244
g-factor
Halveringstid
10,01 ± 0,03 h
Spinn6
nuclear quadrupole moment
upptäcktsdatum1950
Paritet-

244Am Decay Modes
decay modeIntensitet
β (β decay)100%

245Am

natural abundanceRadioactive ☢️
relative atomic mass
245,066452827 ± 0,000002024 Da
masstal245
g-factor
Halveringstid
2,05 ± 0,01 h
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum1955
Paritet+

245Am Decay Modes
decay modeIntensitet
β (β decay)100%

246Am

natural abundanceRadioactive ☢️
relative atomic mass
246,069774 ± 0,000019 Da
masstal246
g-factor
Halveringstid
39 ± 3 m
Spinn7
nuclear quadrupole moment
upptäcktsdatum1955
Paritet-

246Am Decay Modes
decay modeIntensitet
β (β decay)100%

247Am

natural abundanceRadioactive ☢️
relative atomic mass
247,072092 ± 0,000107 Da
masstal247
g-factor
Halveringstid
23 ± 1,3 m
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum1967
Paritet

247Am Decay Modes
decay modeIntensitet
β (β decay)100%

248Am

natural abundanceRadioactive ☢️
relative atomic mass
248,075752 ± 0,000215 Da
masstal248
g-factor
Halveringstid
Spinn3
nuclear quadrupole moment
upptäcktsdatum
Paritet+

248Am Decay Modes
decay modeIntensitet
β (β decay)%

249Am

natural abundanceRadioactive ☢️
relative atomic mass
249,07848 ± 0,00032 Da
masstal249
g-factor
Halveringstid
Spinn5/2
nuclear quadrupole moment
upptäcktsdatum
Paritet

249Am Decay Modes
decay modeIntensitet
β (β decay)%
Americium microscope

historia

upptäckare eller uppfinnareG.T.Seaborg, R.A.James, L.O.Morgan, A.Ghiorso
fyndplatsUnited States
upptäcktsdatum1945
etymologiNamed for the American continent, by analogy with europium.
uttalam-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