Curium Berkelium Comparison
Periodic Table
Symbol
Cm
Bk
Group Number
Not Available
Not Available
Period Number
7
7
Block
f block
f block
Element Family
Actinide
Actinide
CAS Number
7440519
36
7440406
99+
Space Group Name
Not Available
P63/mmc
Space Group Number
Not Available
194.00
5
Facts
Interesting Facts
- Curium metal does not occur free in nature.
- Curium metal is a synthetically produced metal.
- X-ray Diffraction- different compounds of Berkelium metals are identified using it.
- Commercial uses of Berkelium metal are not yet discovered.
Sources
Bombarding Plutonium with Helium Ions
Bombarding Americium with Alpha Particles.
History
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Lawrence Berkeley National Laboratory
Discovery
In 1944
In 1949
Abundance
Uses
Uses & Benefits
- Curium metal is used to provide power to electrical equipment for space missions.
- This metal is very rare and has no commercial uses.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Research Purposes
NA
Biological Properties
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
37
In Bone
0.00 p.p.m.
36
0.00 p.p.m.
36
Physical Properties
Melting Point
1,340.00 °C
34
986.00 °C
99+
Boiling Point
3,110.00 °C
30
2,627.00 °C
40
Appearance
Physical State
Solid
Solid
Color
Silver
Silver
Luster
Metallic
Metallic
Hardness
Speed of Sound
Not Available
Not Available
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Cm
Bk
Isotopes
Known Isotopes
15
24
14
25
Electronegativity
Pauling Electronegativity
1.30
32
1.30
32
Allred Rochow Electronegativity
1.20
27
1.20
27
Allen Electronegativity
Not Available
2.70
1
Electropositivity
Pauling Electropositivity
2.70
22
2.70
22
Ionization Energies
1st Energy Level
581.00 kJ/mol
99+
601.00 kJ/mol
99+
2nd Energy Level
1,196.00 kJ/mol
99+
1,186.00 kJ/mol
99+
3rd Energy Level
2,026.00 kJ/mol
99+
2,152.00 kJ/mol
99+
4th Energy Level
3,550.00 kJ/mol
99+
3,434.00 kJ/mol
99+
Electrochemical Equivalent
3.07 g/amp-hr
16
3.07 g/amp-hr
16
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
96
22
97
21
Electron Configuration
[Rn] 5f7 6d1 7s2
[Rn] 5f9 7s2
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100
DHCP-Crystal-Structure-of-Berkelium.jpg#100
Atom
Number of Protons
96
22
97
21
Number of Neutrons
151
10
150
11
Number of Electrons
96
22
97
21
Radius of an Atom
Atomic Radius
174.00 pm
20
170.00 pm
22
Covalent Radius
169.00 pm
26
Not Available
Van der Waals Radius
200.00 pm
28
Not Available
Atomic Weight
247.00 amu
18
247.00 amu
18
Atomic Volume
18.28 cm3/mol
26
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
44.50 (-eV)
38
45.50 (-eV)
36
Lattice Constant
Not Available
341.60 pm
99+
Lattice Angles
NA
π/2, π/2, 2 π/3
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
13.51 g/cm3
25
14.78 g/cm3
22
Density When Liquid (at m.p.)
13.85 g/cm3
10
13.25 g/cm3
11
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
Unknown
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
13.51
17
14.00
14
Magnetic Ordering
Antiferromagnetic
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
1.25 nΩ·m
99+
Not Available
Thermal Properties
Specific Heat
Not Available
Not Available
Molar Heat Capacity
Not Available
Not Available
Thermal Conductivity
Not Available
10.00 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Enthalpy of Fusion
15.00 kJ/mol
21
Not Available
Standard Molar Entropy
Not Available
Not Available
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