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Curium Promethium Comparison

Curium
Promethium
Promethium Curium 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
  
  
Previous Element
Americium
  
Neodymium
  
Next Element
Berkelium
  
Samarium
  
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   
Summary >>
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