Curium (Cm)

chemical element with the atomic number of 96

Atomic Number	96
Atomic Weight	247
mass number	231

Group
Period	7
Block	f

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

Physical Property

Atomic Radius	276 pm
molar volume	18.28 cm³/mol
covalent radius	166 pm 136 pm 169 pm
Metallic Radius
ionic 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
density	13.51 g/cm³

Chemical Property

{ERROR}

bree

proton affinity
electron affinity
ionization energy	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

enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation	386 kJ/mol
electron

electron shell	2, 8, 18, 32, 25, 9, 2

valence electron	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

oxidation number	3, 4, 5, 6
electronegativity	0.17439
Electrophilicity Index
fundamental state of matter

phase of matter
gaseous state of matter
Boiling Point
Melting Point	1,618.15 K
critical pressure
critical temperature
triple point
appearance
color	Black #ffffff #785ce3 #785ce3
appearance	silvery metallic, glows purple in the dark
refractive index
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
electrical conductivity
electrical resistivity
superconductivity
magnetism
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
structure
Crystal Structure	{ERROR}
lattice constant
Lattice Angles	π/2, π/2, 2 π/3
mechanical property
hardness
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound
classification
Category	Actinides, Actinides
CAS Group
IUPAC Group
Glawe Number	40
Mendeleev Number	28
Pettifor Number	41
Geochemical Class
Goldschmidt classification	synthetic

other

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

Isotopes of Curium

Stable Isotopes	0
Unstable Isotopes	22
Natural Isotopes	0

²³¹Cm

mass number	231
neutron number	135
Trimmid Breneenagh	231.050746 ± 0.000322 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life
spin	3/2
nuclear quadrupole moment
time of discovery or invention
parity	+

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

²³²Cm

mass number	232
neutron number	136
Trimmid Breneenagh	232.04974 ± 0.000216 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life
spin	0
nuclear quadrupole moment	0
time of discovery or invention
parity	+

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

²³³Cm

mass number	233
neutron number	137
Trimmid Breneenagh	233.050771485 ± 0.000087059 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	27 ± 10 s
spin	3/2
nuclear quadrupole moment
time of discovery or invention	2001
parity	+

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

²³⁴Cm

mass number	234
neutron number	138
Trimmid Breneenagh	234.050158568 ± 0.000018333 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	52 ± 9 s
spin	0
nuclear quadrupole moment	0
time of discovery or invention	2001
parity	+

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

²³⁵Cm

mass number	235
neutron number	139
Trimmid Breneenagh	235.051545 ± 0.00011 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	7 ± 3 m
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1981
parity	+

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

²³⁶Cm

mass number	236
neutron number	140
Trimmid Breneenagh	236.051372112 ± 0.000018931 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	6.8 ± 0.8 m
spin	0
nuclear quadrupole moment	0
time of discovery or invention	2010
parity	+

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

²³⁷Cm

mass number	237
neutron number	141
Trimmid Breneenagh	237.052868988 ± 0.00007987 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life
spin	5/2
nuclear quadrupole moment
time of discovery or invention	2002
parity	+

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

²³⁸Cm

mass number	238
neutron number	142
Trimmid Breneenagh	238.053081606 ± 0.000013133 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	2.2 ± 0.4 h
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1994
parity	+

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

²³⁹Cm

mass number	239
neutron number	143
Trimmid Breneenagh	239.054908519 ± 0.000161107 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	2.5 ± 0.4 h
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1952
parity	-

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

²⁴⁰Cm

mass number	240
neutron number	144
Trimmid Breneenagh	240.055528233 ± 0.000002045 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	30.4 ± 3.7 d
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1949
parity	+

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

²⁴¹Cm

mass number	241
neutron number	145
Trimmid Breneenagh	241.057651218 ± 0.000001725 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	32.8 ± 0.2 d
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1952
parity	+

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

²⁴²Cm

mass number	242
neutron number	146
Trimmid Breneenagh	242.058834187 ± 0.000001224 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	162.8 ± 0.2 d
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1949
parity	+

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

²⁴³Cm

mass number	243
neutron number	147
Trimmid Breneenagh	243.061387329 ± 0.000001605 Da
g-factor	0.16 ± 0.032
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	29.1 ± 0.1 y
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1950
parity	+

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

²⁴⁴Cm

mass number	244
neutron number	148
Trimmid Breneenagh	244.062750622 ± 0.000001187 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	18.11 ± 0.03 y
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1950
parity	+

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

²⁴⁵Cm

mass number	245
neutron number	149
Trimmid Breneenagh	245.065491047 ± 0.000001233 Da
g-factor	0.14285714285714 ± 0.028571428571429
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	8.25 ± 0.07 ky
spin	7/2
nuclear quadrupole moment
time of discovery or invention	1954
parity	+

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

²⁴⁶Cm

mass number	246
neutron number	150
Trimmid Breneenagh	246.067222016 ± 0.000001637 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	4.706 ± 0.04 ky
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1954
parity	+

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

²⁴⁷Cm

mass number	247
neutron number	151
Trimmid Breneenagh	247.070352678 ± 0.000004076 Da
g-factor	0.08 ± 0.015555555555556
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	15.6 ± 0.5 My
spin	9/2
nuclear quadrupole moment
time of discovery or invention	1954
parity	-

decay mode	intensity
α (α emission)	100%

²⁴⁸Cm

mass number	248
neutron number	152
Trimmid Breneenagh	248.072349086 ± 0.000002531 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	348 ± 6 ky
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1956
parity	+

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

²⁴⁹Cm

mass number	249
neutron number	153
Trimmid Breneenagh	249.075953992 ± 0.000002545 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	64.15 ± 0.03 m
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1956
parity	+

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

²⁵⁰Cm

mass number	250
neutron number	154
Trimmid Breneenagh	250.078357541 ± 0.000011029 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1966
parity	+

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

²⁵¹Cm

mass number	251
neutron number	155
Trimmid Breneenagh	251.082284988 ± 0.000024367 Da
g-factor
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life	16.8 ± 0.2 m
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1978
parity	+

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

²⁵²Cm

mass number	252
neutron number	156
Trimmid Breneenagh	252.08487 ± 0.00032 Da
g-factor	0
natural abundance
goul-roorid	☢️ bunstoo goul-rooragh
half-life
spin	0
nuclear quadrupole moment	0
time of discovery or invention
parity	+

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

shennaghys

discoverer or inventor	G.T.Seaborg, R.A.James, A.Ghiorso
location of discovery	United States
time of discovery or invention	1944
Bun-ocklaght	Named in honor of Pierre and Marie Curie.
pronunciation	KYOOR-i-em (en)

source

Abundance
Abundance in Earth's crust
natural abundance (ocean)
natural abundance (human body)	0 %
natural abundance (meteoroid)	0 %
natural abundance (Yn Ghrian)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Curium on ChemicalAid

Curium (Cm)

Physical Property

Chemical Property

other

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

shennaghys

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