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Curium


Periodic Table
Symbol
Cm
Group Number
3 15
Period Number
7 1
Block
f block
Element Family
Actinide
CAS Number
7440519 36
Space Group Name
-
Space Group Number
225.00 3
Facts
Interesting Facts
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
Sources
Bombarding Plutonium with Helium Ions
History
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Discovery
In 1944
Abundance
Abundance In Universe
0.00 % 35
Abundance In Sun
0.00 % 30
Abundance In Meteorites
0.00 % 54
Abundance In Earth's Crust
0.00 % 60
Abundance In Oceans
-
Abundance In Humans
0.00 % 24
Uses
Uses & Benefits
  • Curium metal is used to provide power to electrical equipment for space missions.
Industrial Uses
-
Medical Uses
-
Other Uses
Research Purposes
Biological Properties
Toxicity
-
Present in Human Body
No
In Blood
0.00 Blood/mg dm-3 40
In Bone
0.00 p.p.m. 41
Physical
Melting Point
1,340.00 °C 34
Boiling Point
3,110.00 °C 31
Appearance
Physical State
Solid
Color
Silver
Luster
Metallic
Hardness
Mohs Hardness
2.00 17
Brinell Hardness
320.00 MPa 40
Vickers Hardness
461.00 MPa 37
Speed of Sound
2,260.00 m/s 58
Optical Properties
Refractive Index
1.30 43
Reflectivity
60.00 % 23
Allotropes
No
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical
Chemical Formula
Cm
Isotopes
Known Isotopes
15 24
Electronegativity
Pauling Electronegativity
1.30 33
Sanderson Electronegativity
1.30 25
Allred Rochow Electronegativity
1.20 28
Mulliken-Jaffe Electronegativity
1.30 33
Allen Electronegativity
1.30 40
Electropositivity
Pauling Electropositivity
2.70 22
Ionization Energies
1st Energy Level
581.00 kJ/mol 62
2nd Energy Level
1,196.00 kJ/mol 62
3rd Energy Level
2,026.00 kJ/mol 76
4th Energy Level
3,550.00 kJ/mol 64
5th Energy Level
5,810.00 kJ/mol 54
6th Energy Level
5,810.00 kJ/mol 67
7th Energy level
5,810.00 kJ/mol 59
8th Energy Level
5,810.00 kJ/mol 57
9th Energy Level
6,690.00 kJ/mol 37
10th Energy Level
5,810.00 kJ/mol 57
11th Energy Level
5,810.00 kJ/mol 62
12th Energy Level
58,100.00 kJ/mol 19
13th Energy Level
5,810.00 kJ/mol 51
14th Energy Level
5,810.00 kJ/mol 40
15th Energy Level
58,100.00 kJ/mol 52
16th Energy Level
58,100.00 kJ/mol 41
17th Energy Level
581.00 kJ/mol 63
18th Energy Level
5,810.00 kJ/mol 54
19th Energy Level
581.00 kJ/mol 61
20th Energy Level
581.00 kJ/mol 57
21st Energy Level
5,810.00 kJ/mol 20
22nd Energy Level
581.00 kJ/mol 52
23rd Energy Level
5,810.00 kJ/mol 20
24th Energy Level
581.00 kJ/mol 54
25th Energy Level
581.00 kJ/mol 56
26th Energy Level
581.00 kJ/mol 59
27th Energy Level
581.00 kJ/mol 57
28th Energy Level
581.00 kJ/mol 61
29th Energy Level
581.00 kJ/mol 62
30th Energy Level
581.00 kJ/mol 59
Electrochemical Equivalent
3.07 g/amp-hr 19
Electron Work Function
4.50 eV 19
Other Chemical Properties
Ionization, Radioactive Isotopes
Atomic
Atomic Number
96 22
Electron Configuration
[Rn] 5f7 6d1 7s2
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100
Atom
Number of Protons
96 22
Number of Neutrons
151 11
Number of Electrons
96 22
Radius of an Atom
Atomic Radius
174.00 pm 22
Covalent Radius
169.00 pm 28
Van der Waals Radius
200.00 pm 35
Atomic Weight
247.00 amu 18
Atomic Volume
18.28 cm3/mol 38
Adjacent Atomic Numbers
Previous Element
55
Next Element
86
Valence Electron Potential
44.50 (-eV) 39
Lattice Constant
336.25 pm 53
Lattice Angles
-
Lattice C/A Ratio
1.67 11
Mechanical
Density
Density At Room Temperature
13.51 g/cm3 26
Density When Liquid (at m.p.)
13.85 g/cm3 25
Tensile Strength
350.00 MPa 12
Viscosity
0.00 25
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa) 22
Vapor Pressure at 2000 K
0.00 (Pa) 24
Elasticity properties
Shear Modulus
32.00 GPa 24
Bulk Modulus
40.00 GPa 38
Young's Modulus
0.00 GPa 74
Poisson Ratio
0.35 9
Other Mechanical Properties
-
Magnetic
Magnetic Characteristics
Specific Gravity
13.51 28
Magnetic Ordering
Antiferromagnetic
Permeability
0.00 H/m 17
Susceptibility
0.00 24
Electrical Properties
Electrical Property
-
Resistivity
1.25 nΩ·m 70
Electrical Conductivity
0.13 106/cm Ω 19
Electron Affinity
0.00 kJ/mol 49
Thermal
Specific Heat
0.10 J/(kg K) 44
Molar Heat Capacity
27.50 J/mol·K 21
Thermal Conductivity
11.00 W/m·K 65
Critical Temperature
1,340.00 K 45
Thermal Expansion
11.60 µm/(m·K) 46
Enthalpy
Enthalpy of Vaporization
331.60 kJ/mol 40
Enthalpy of Fusion
15.00 kJ/mol 22
Enthalpy of Atomization
-
Standard Molar Entropy
52.50 J/mol.K 36
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