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Curium vs Promethium

Curium
Promethium
Promethium vs Curium


Periodic Table
Symbol
Cm  
Pm  
Group Number
3  
15
3  
15
Period Number
7  
6  
Block
f block  
f block  
Element Family
Actinide  
Lanthanide  
CAS Number
7440519  
36
7440122  
99+
Space Group Name
-  
-  
Space Group Number
225.00  
3
194.00  
7
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
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
40
Abundance In Sun
0.00 %  
30
-  
Abundance In Meteorites
0.00 %  
99+
-  
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
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
-  
-  
Medical Uses
-  
-  
Other Uses
Research Purposes  
-  
Biological Properties
  
  
Toxicity
-  
Non Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,340.00 °C  
34
1,042.00 °C  
99+
Boiling Point
3,110.00 °C  
31
3,000.00 °C  
32
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
-  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
2.00  
17
-  
Brinell Hardness
320.00 MPa  
40
400.00 MPa  
34
Vickers Hardness
461.00 MPa  
37
600.00 MPa  
28
Speed of Sound
2,260.00 m/s  
99+
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.70  
27
Reflectivity
60.00 %  
23
63.00 %  
20
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cm  
Pm  
Isotopes
  
  
Known Isotopes
15  
24
27  
12
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.13  
99+
Sanderson Electronegativity
1.30  
25
1.13  
36
Allred Rochow Electronegativity
1.20  
28
1.07  
33
Mulliken-Jaffe Electronegativity
1.30  
33
1.13  
99+
Allen Electronegativity
1.30  
40
1.13  
99+
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.20  
39
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  
99+
5th Energy Level
5,810.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
6th Energy Level
5,810.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
7th Energy level
5,810.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
8th Energy Level
5,810.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
9th Energy Level
6,690.00 kJ/mol  
37
5,400.00 kJ/mol  
99+
10th Energy Level
5,810.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
11th Energy Level
5,810.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
12th Energy Level
58,100.00 kJ/mol  
19
5,400.00 kJ/mol  
99+
13th Energy Level
5,810.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
14th Energy Level
5,810.00 kJ/mol  
40
5,400.00 kJ/mol  
99+
15th Energy Level
58,100.00 kJ/mol  
99+
54,000.00 kJ/mol  
99+
16th Energy Level
58,100.00 kJ/mol  
99+
54,000.00 kJ/mol  
99+
17th Energy Level
581.00 kJ/mol  
99+
540.50 kJ/mol  
99+
18th Energy Level
5,810.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
19th Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
20th Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
21st Energy Level
5,810.00 kJ/mol  
20
540.00 kJ/mol  
99+
22nd Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
23rd Energy Level
5,810.00 kJ/mol  
20
540.00 kJ/mol  
99+
24th Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
25th Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
26th Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
27th Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
28th Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
29th Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
30th Energy Level
581.00 kJ/mol  
99+
540.00 kJ/mol  
99+
Electrochemical Equivalent
3.07 g/amp-hr  
19
1.80 g/amp-hr  
40
Electron Work Function
4.50 eV  
19
5.30 eV  
5
Other Chemical Properties
Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Solubility  
Atomic
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  
11
84  
99+
Number of Electrons
96  
22
61  
99+
Radius of an Atom
  
  
Atomic Radius
174.00 pm  
22
183.00 pm  
12
Covalent Radius
169.00 pm  
28
199.00 pm  
12
Van der Waals Radius
200.00 pm  
35
236.00 pm  
20
Atomic Weight
247.00 amu  
18
145.00 amu  
99+
Atomic Volume
18.28 cm3/mol  
38
22.39 cm3/mol  
21
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Neodymium
  
Next Element
Berkelium
  
Samarium
  
Valence Electron Potential
44.50 (-eV)  
39
44.10 (-eV)  
40
Lattice Constant
336.25 pm  
99+
-  
Lattice Angles
-  
-  
Lattice C/A Ratio
1.67  
11
1.63  
14
Mechanical
Density
  
  
Density At Room Temperature
13.51 g/cm3  
26
7.26 g/cm3  
99+
Density When Liquid (at m.p.)
13.85 g/cm3  
25
7.26 g/cm3  
99+
Tensile Strength
350.00 MPa  
12
75.00 MPa  
30
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
31
Elasticity properties
  
  
Shear Modulus
32.00 GPa  
24
18.00 GPa  
99+
Bulk Modulus
40.00 GPa  
38
33.00 GPa  
99+
Young's Modulus
0.00 GPa  
99+
46.00 GPa  
99+
Poisson Ratio
0.35  
9
0.28  
17
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.51  
28
7.26  
99+
Magnetic Ordering
Antiferromagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
25
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
1.25 nΩ·m  
99+
0.75 nΩ·m  
99+
Electrical Conductivity
0.13 106/cm Ω  
19
0.00 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
50.00 kJ/mol  
26
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.18 J/(kg K)  
34
Molar Heat Capacity
27.50 J/mol·K  
21
27.60 J/mol·K  
20
Thermal Conductivity
11.00 W/m·K  
99+
17.90 W/m·K  
99+
Critical Temperature
1,340.00 K  
99+
1,315.00 K  
99+
Thermal Expansion
11.60 µm/(m·K)  
99+
9.00 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
331.60 kJ/mol  
40
289.00 kJ/mol  
99+
Enthalpy of Fusion
15.00 kJ/mol  
22
7.50 kJ/mol  
99+
Enthalpy of Atomization
-  
310.00 kJ/mol  
99+
Standard Molar Entropy
52.50 J/mol.K  
36
57.00 J/mol.K  
30
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