Curium Promethium Comparison
Periodic Table
Symbol
Cm
Pm
Group Number
Not Available
Not Available
Period Number
7
6
Block
f block
f block
Element Family
Actinide
Lanthanide
CAS Number
7440519
36
7440122
99+
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- Curium metal does not occur free in nature.
- Curium metal is a synthetically produced metal.
- Promethium metal found in Pitchblende.
- Promethium metal is highly radioactive metal.
Sources
Bombarding Plutonium with Helium Ions
Found in Minerals, Mining
History
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Chien Shiung Wu, Emilio Segrè, Hans Bethe
Discovery
In 1944
In 1942
Abundance
Uses
Uses & Benefits
- Curium metal is used to provide power to electrical equipment for space missions.
- It is used for research purpose. Very small amount of this metal is used in atomic batteries.
- Its radioactive decay is used for a phosphor to give off light. The light emitted is converted into electricity.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Research Purposes
NA
Biological Properties
Toxicity
Unknown
Non Toxic
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
Not Available
Physical Properties
Melting Point
1,340.00 °C
34
1,042.00 °C
99+
Boiling Point
3,110.00 °C
30
3,000.00 °C
31
Appearance
Physical State
Solid
Solid
Color
Silver
Unknown
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
Pm
Isotopes
Known Isotopes
15
24
27
12
Electronegativity
Pauling Electronegativity
1.30
32
Not Available
Allred Rochow Electronegativity
1.20
27
1.07
32
Electropositivity
Pauling Electropositivity
2.70
22
Not Available
Ionization Energies
1st Energy Level
581.00 kJ/mol
99+
540.00 kJ/mol
99+
2nd Energy Level
1,196.00 kJ/mol
99+
1,050.00 kJ/mol
99+
3rd Energy Level
2,026.00 kJ/mol
99+
2,150.00 kJ/mol
99+
4th Energy Level
3,550.00 kJ/mol
99+
3,970.00 kJ/mol
38
Electrochemical Equivalent
3.07 g/amp-hr
16
1.80 g/amp-hr
36
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes
Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
96
22
61
99+
Electron Configuration
[Rn] 5f7 6d1 7s2
[Xe] 4f5 6s2
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-Promethium.jpg#100
Atom
Number of Protons
96
22
61
99+
Number of Neutrons
151
10
84
40
Number of Electrons
96
22
61
99+
Radius of an Atom
Atomic Radius
174.00 pm
20
183.00 pm
10
Covalent Radius
169.00 pm
26
199.00 pm
12
Van der Waals Radius
200.00 pm
28
236.00 pm
16
Atomic Weight
247.00 amu
18
145.00 amu
99+
Atomic Volume
18.28 cm3/mol
26
22.39 cm3/mol
12
Adjacent Atomic Numbers
Valence Electron Potential
44.50 (-eV)
38
44.10 (-eV)
39
Lattice Constant
Not Available
Not Available
Lattice Angles
NA
Unknown
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
13.51 g/cm3
25
7.26 g/cm3
99+
Density When Liquid (at m.p.)
13.85 g/cm3
10
Not Available
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Shear Modulus
Not Available
18.00 GPa
36
Bulk Modulus
Not Available
33.00 GPa
36
Young's Modulus
Not Available
46.00 GPa
38
Poisson Ratio
Not Available
0.28
17
Other Mechanical Properties
Unknown
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
13.51
17
7.26
99+
Magnetic Ordering
Antiferromagnetic
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
1.25 nΩ·m
99+
0.75 nΩ·m
99+
Electron Affinity
Not Available
50.00 kJ/mol
21
Thermal Properties
Specific Heat
Not Available
0.18 J/(kg K)
33
Molar Heat Capacity
Not Available
Not Available
Thermal Conductivity
Not Available
17.90 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
9.00 µm/(m·K)
99+
Enthalpy
Enthalpy of Fusion
15.00 kJ/mol
21
7.50 kJ/mol
99+
Enthalpy of Atomization
Not Available
310.00 kJ/mol
34
Standard Molar Entropy
Not Available
Not Available
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