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