Bohrium vs Curium
Periodic Table
Symbol
Bh
Cm
Group Number
7
11
Not Available
Period Number
7
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
54037148
12
7440519
36
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
- Curium metal does not occur free in nature.
- Curium metal is a synthetically produced metal.
Sources
Found in Minerals, Mining, Synthetically Produced
Bombarding Plutonium with Helium Ions
History
Who Discovered
Gesellschaft für Schwerionenforschung
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Discovery
In 1981
In 1944
Abundance
Uses
Uses & Benefits
- Currently known uses of Bohrium metal are limited to research purpose only.
- Curium metal is used to provide power to electrical equipment for space missions.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Research Purposes
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
Not Available
1,340.00 °C
34
Boiling Point
Not Available
3,110.00 °C
30
Appearance
Physical State
Solid
Solid
Color
Unknown
Silver
Luster
Unknown Luster
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
Bh
Cm
Isotopes
Known Isotopes
5
32
15
24
Electronegativity
Pauling Electronegativity
Not Available
1.30
32
Allred Rochow Electronegativity
Not Available
1.20
27
Electropositivity
Pauling Electropositivity
Not Available
2.70
22
Ionization Energies
1st Energy Level
742.90 kJ/mol
23
581.00 kJ/mol
99+
2nd Energy Level
1,688.50 kJ/mol
30
1,196.00 kJ/mol
99+
3rd Energy Level
2,566.50 kJ/mol
99+
2,026.00 kJ/mol
99+
4th Energy Level
3,598.90 kJ/mol
99+
3,550.00 kJ/mol
99+
5th Energy Level
4,727.80 kJ/mol
37
Not Available
6th Energy Level
5,991.70 kJ/mol
24
Not Available
7th Energy level
7,226.80 kJ/mol
22
Not Available
Electrochemical Equivalent
Not Available
3.07 g/amp-hr
16
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes
Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
107
11
96
22
Electron Configuration
[Rn] 5f14 6d5 7s2
[Rn] 5f7 6d1 7s2
Crystal Structure
Hexagonal Close Packed (HCP)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
DHCP-Crystal-Structure-of-Curium.jpg#100
Atom
Number of Protons
107
11
96
22
Number of Neutrons
155
8
151
10
Number of Electrons
107
11
96
22
Radius of an Atom
Atomic Radius
128.00 pm
99+
174.00 pm
20
Covalent Radius
141.00 pm
99+
169.00 pm
26
Van der Waals Radius
Not Available
200.00 pm
28
Atomic Weight
270.00 amu
8
247.00 amu
18
Atomic Volume
Not Available
18.28 cm3/mol
26
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
44.50 (-eV)
38
Lattice Constant
Not Available
Not Available
Lattice Angles
NA
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
37.10 g/cm3
3
13.51 g/cm3
25
Density When Liquid (at m.p.)
Not Available
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
Unknown
Unknown
Magnetic Properties
Magnetic Characteristics
Specific Gravity
Not Available
13.51
17
Magnetic Ordering
Unknown
Antiferromagnetic
Electrical Properties
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
Not Available
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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