Curium (Cm)

grundstof med atomnummer 96

Atomnummer	96
Atommasse	247
mass number	231

Gruppe
Periode	7
Blok	f

proton	96 p⁺
neutron	135 n⁰
elektron	96 e^-

Fysisk Egenskab

Atomradius	276 pm
molar volume	18,28 cm³/mol
Kovalent Radius	166 pm 136 pm 169 pm
Metallic Radius
Ionisk radius	97 pm 85 pm 95 pm 114,7 pm
Crystal Radius	111 pm 99 pm 109 pm 128,7 pm
Van der Waals-radius	245 pm 332,6 pm
massefylde	13,51 g/cm³

Kemisk Egenskab

{ERROR}

energi

proton affinity
electron affinity
ioniseringsenergi	5,9914 eV/particle 10 eV/particle 20,1 eV/particle 37,7 eV/particle 51 eV/particle 69,1 eV/particle 97 eV/particle 112 eV/particle 128 eV/particle 144 eV/particle 167 eV/particle 190 eV/particle 212 eV/particle 235 eV/particle 253 eV/particle 272 eV/particle 311 eV/particle 332 eV/particle 460 eV/particle 489 eV/particle 518 eV/particle 550 eV/particle 580 eV/particle 611 eV/particle 657 eV/particle 689 eV/particle 723 eV/particle 755 eV/particle 910 eV/particle 950 eV/particle 990 eV/particle 1.030 eV/particle 1.140 eV/particle 1.180 eV/particle 1.300 eV/particle 1.340 eV/particle 1.480 eV/particle 1.560 eV/particle 1.640 eV/particle 1.730 eV/particle 1.810 eV/particle 1.890 eV/particle 1.980 eV/particle 2.060 eV/particle 2.160 eV/particle 2.240 eV/particle 2.320 eV/particle 2.410 eV/particle 2.490 eV/particle 2.580 eV/particle 2.976 eV/particle 3.050 eV/particle 3.125 eV/particle 3.207 eV/particle 3.284 eV/particle 3.360 eV/particle 3.515 eV/particle 3.593 eV/particle 3.679 eV/particle 3.758 eV/particle 4.078 eV/particle 4.156 eV/particle 4.239 eV/particle 4.317 eV/particle 4.791 eV/particle 4.880 eV/particle 5.110 eV/particle 5.200 eV/particle 8.270 eV/particle 8.440 eV/particle 8.620 eV/particle 8.820 eV/particle 9.000 eV/particle 9.180 eV/particle 9.630 eV/particle 9.820 eV/particle 10.020 eV/particle 10.220 eV/particle 10.760 eV/particle 10.920 eV/particle 11.100 eV/particle 11.270 eV/particle 12.740 eV/particle 12.950 eV/particle 13.360 eV/particle 13.550 eV/particle 27.740 eV/particle 28.180 eV/particle 28.700 eV/particle 29.100 eV/particle 34.600 eV/particle 35.200 eV/particle 36.000 eV/particle 36.493 eV/particle 143.299,6 eV/particle 145.743 eV/particle

Fordampningsvarme
smeltevarme
standard enthalpy of formation	386 kJ/mol
elektron

Elektronskal	2, 8, 18, 32, 25, 9, 2

Valenselektron	2 ⓘ

electron configuration	[Rn] 5f⁷ 6d¹ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f⁷ 6d¹ 7s²

Oxidationstrin	3, 4, 5, 6
Elektronegativitet	0.17439
Electrophilicity Index
fundamental state of matter

stoffase
gaseous state of matter
Kogepunkt
Smeltepunkt	1.618,15 K
critical pressure
critical temperature
trippelpunkt
appearance
farve	Sort #ffffff #785ce3 #785ce3
appearance	silvery metallic, glows purple in the dark
Brydningsindeks
materialeegenskab
Varmeledningsevne
Termisk ekspansion
molar heat capacity
Varmefylde
Adiabateksponenten
electrical properties
type
specifik ledningsevne
Elektrisk resistivitet
superledning
Magnetisme
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curietemperaturen
Néel temperature
struktur
Krystalstruktur	{ERROR}
lattice constant
Lattice Angles	π/2, π/2, 2 π/3
mechanical property
hårdhed
Kompressibilitetsmodul
Forskydningsmodul
E-modul
Poissons forhold
speed of sound
klassificering
Kategori	Actinider, Actinides
CAS Group
IUPAC Group
Glawe Number	40
Mendeleev Number	28
Pettifor Number	41
Geochemical Class
Goldschmidt classification	synthetic

øvrige

Gas Basicity
polarizability	144 ± 25 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	60
Neutron Mass Absorption
quantum number	9D2
rumgruppe	194 (P63/mmc)

Isotopes of Curium

Stable Isotopes	0
Unstable Isotopes	22
Natural Isotopes	0

²³¹Cm

mass number	231
neutron number	135
Relative Atomic Mass	231,050746 ± 0,000322 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	3/2
nuclear quadrupole moment
opdagelsesdato
Paritet	+

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

²³²Cm

mass number	232
neutron number	136
Relative Atomic Mass	232,04974 ± 0,000216 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato
Paritet	+

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

²³³Cm

mass number	233
neutron number	137
Relative Atomic Mass	233,050771485 ± 0,000087059 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	27 ± 10 s
spin	3/2
nuclear quadrupole moment
opdagelsesdato	2001
Paritet	+

decay mode	Intensitet
α (α emission)	20%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	80%

²³⁴Cm

mass number	234
neutron number	138
Relative Atomic Mass	234,050158568 ± 0,000018333 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	52 ± 9 s
spin	0
nuclear quadrupole moment	0
opdagelsesdato	2001
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	71%
α (α emission)	27%
SF (spontaneous fission)	2%

²³⁵Cm

mass number	235
neutron number	139
Relative Atomic Mass	235,051545 ± 0,00011 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	7 ± 3 m
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1981
Paritet	+

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

²³⁶Cm

mass number	236
neutron number	140
Relative Atomic Mass	236,051372112 ± 0,000018931 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	6,8 ± 0,8 m
spin	0
nuclear quadrupole moment	0
opdagelsesdato	2010
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	82%
α (α emission)	18%
SF (spontaneous fission)

²³⁷Cm

mass number	237
neutron number	141
Relative Atomic Mass	237,052868988 ± 0,00007987 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	5/2
nuclear quadrupole moment
opdagelsesdato	2002
Paritet	+

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

²³⁸Cm

mass number	238
neutron number	142
Relative Atomic Mass	238,053081606 ± 0,000013133 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,2 ± 0,4 h
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1994
Paritet	+

decay mode	Intensitet
ϵ (electron capture)
α (α emission)	3.84%
SF (spontaneous fission)	0.048%

²³⁹Cm

mass number	239
neutron number	143
Relative Atomic Mass	239,054908519 ± 0,000161107 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,5 ± 0,4 h
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1952
Paritet	-

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	6.2%

²⁴⁰Cm

mass number	240
neutron number	144
Relative Atomic Mass	240,055528233 ± 0,000002045 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	30,4 ± 3,7 d
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1949
Paritet	+

decay mode	Intensitet
α (α emission)	100%
ϵ (electron capture)
SF (spontaneous fission)	3.9%

²⁴¹Cm

mass number	241
neutron number	145
Relative Atomic Mass	241,057651218 ± 0,000001725 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	32,8 ± 0,2 d
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1952
Paritet	+

decay mode	Intensitet
ϵ (electron capture)	99%
α (α emission)	1%

²⁴²Cm

mass number	242
neutron number	146
Relative Atomic Mass	242,058834187 ± 0,000001224 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	162,8 ± 0,2 d
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1949
Paritet	+

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)	6.2%
34Si	1.1%
2β⁺ (double β⁺ decay)

²⁴³Cm

mass number	243
neutron number	147
Relative Atomic Mass	243,061387329 ± 0,000001605 Da
g-factor	0,16 ± 0,032
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	29,1 ± 0,1 y
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1950
Paritet	+

decay mode	Intensitet
α (α emission)	100%
ϵ (electron capture)	0.29%
SF (spontaneous fission)	5.3%

²⁴⁴Cm

mass number	244
neutron number	148
Relative Atomic Mass	244,062750622 ± 0,000001187 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	18,11 ± 0,03 y
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1950
Paritet	+

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)	1.37%

²⁴⁵Cm

mass number	245
neutron number	149
Relative Atomic Mass	245,065491047 ± 0,000001233 Da
g-factor	0,14285714285714 ± 0,028571428571429
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	8,25 ± 0,07 ky
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1954
Paritet	+

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)	6.1%

²⁴⁶Cm

mass number	246
neutron number	150
Relative Atomic Mass	246,067222016 ± 0,000001637 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	4,706 ± 0,04 ky
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1954
Paritet	+

decay mode	Intensitet
α (α emission)	99.97385%
SF (spontaneous fission)	0.02615%

²⁴⁷Cm

mass number	247
neutron number	151
Relative Atomic Mass	247,070352678 ± 0,000004076 Da
g-factor	0,08 ± 0,015555555555556
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	15,6 ± 0,5 My
spin	9/2
nuclear quadrupole moment
opdagelsesdato	1954
Paritet	-

decay mode	Intensitet
α (α emission)	100%

²⁴⁸Cm

mass number	248
neutron number	152
Relative Atomic Mass	248,072349086 ± 0,000002531 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	348 ± 6 ky
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1956
Paritet	+

decay mode	Intensitet
α (α emission)	91.61%
SF (spontaneous fission)	8.39%
2β⁻ (double β⁻ decay)

²⁴⁹Cm

mass number	249
neutron number	153
Relative Atomic Mass	249,075953992 ± 0,000002545 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	64,15 ± 0,03 m
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1956
Paritet	+

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

²⁵⁰Cm

mass number	250
neutron number	154
Relative Atomic Mass	250,078357541 ± 0,000011029 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1966
Paritet	+

decay mode	Intensitet
SF (spontaneous fission)	74%
α (α emission)
β⁻ (β⁻ decay)

²⁵¹Cm

mass number	251
neutron number	155
Relative Atomic Mass	251,082284988 ± 0,000024367 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	16,8 ± 0,2 m
spin	3/2
nuclear quadrupole moment
opdagelsesdato	1978
Paritet	+

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

²⁵²Cm

mass number	252
neutron number	156
Relative Atomic Mass	252,08487 ± 0,00032 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	0
nuclear quadrupole moment	0
opdagelsesdato
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)
α (α emission)

historie

opdager eller opfinder	G.T.Seaborg, R.A.James, A.Ghiorso
fundsted	United States
opdagelsesdato	1944
etymologi	Named in honor of Pierre and Marie Curie.
udtale	KYOOR-i-em (engelsk)

source

Forekomst
Abundance in Earth's crust
natural abundance (verdenshave)
natural abundance (menneskelige krop)	0 %
natural abundance (Meteoroid)	0 %
natural abundance (Solen)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Curium on ChemicalAid

Curium (Cm)

Fysisk Egenskab

Kemisk Egenskab

øvrige

Isotopes of Curium

231Cm

232Cm

233Cm

234Cm

235Cm

236Cm

237Cm

238Cm

239Cm

240Cm

241Cm

242Cm

243Cm

244Cm

245Cm

246Cm

247Cm

248Cm

249Cm

250Cm

251Cm

252Cm

historie

source

Nuclear Screening Constants

²³¹Cm

²³²Cm

²³³Cm

²³⁴Cm

²³⁵Cm

²³⁶Cm

²³⁷Cm

²³⁸Cm

²³⁹Cm

²⁴⁰Cm

²⁴¹Cm

²⁴²Cm

²⁴³Cm

²⁴⁴Cm

²⁴⁵Cm

²⁴⁶Cm

²⁴⁷Cm

²⁴⁸Cm

²⁴⁹Cm

²⁵⁰Cm

²⁵¹Cm

²⁵²Cm