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Protactinium Promethium Comparison

Protactinium
Promethium
Promethium Protactinium comparison


Periodic Table
Symbol
Pa  
Pm  
Group Number
3  
15
3  
15
Period Number
7  
6  
Block
f block  
f block  
Element Family
Actinide  
Lanthanide  
CAS Number
7440133  
99+
7440122  
99+
Space Group Name
I4/mmm  
-  
Space Group Number
139.00  
11
194.00  
7
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
Sources
Found in Uranium Ores, Mining, Ores of metals  
Found in Minerals, Mining  
History
  
  
Who Discovered
William Crookes  
Chien Shiung Wu, Emilio Segrè, Hans Bethe  
Discovery
In 1900  
In 1942  
Abundance
  
  
Abundance In Universe
0.00 %  
17
0.00 %  
40
Abundance In Sun
0.00 %  
26
-  
Abundance In Meteorites
-  
-  
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • 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
-  
-  
Biological Properties
  
  
Toxicity
Highly Toxic  
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
1,568.00 °C  
21
1,042.00 °C  
99+
Boiling Point
4,027.00 °C  
12
3,000.00 °C  
32
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
-  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
5.00  
8
-  
Brinell Hardness
125.00 MPa  
99+
400.00 MPa  
34
Vickers Hardness
220.00 MPa  
99+
600.00 MPa  
28
Speed of Sound
12,400.00 m/s  
3
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.60  
33
1.70  
27
Reflectivity
60.00 %  
23
63.00 %  
20
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Pa  
Pm  
Isotopes
  
  
Known Isotopes
27  
12
27  
12
Electronegativity
  
  
Pauling Electronegativity
1.50  
28
1.13  
99+
Sanderson Electronegativity
1.50  
18
1.13  
36
Allred Rochow Electronegativity
1.14  
29
1.07  
33
Mulliken-Jaffe Electronegativity
1.50  
26
1.13  
99+
Allen Electronegativity
1.50  
32
1.13  
99+
Electropositivity
  
  
Pauling Electropositivity
2.50  
27
2.20  
39
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
2nd Energy Level
1,128.00 kJ/mol  
99+
1,050.00 kJ/mol  
99+
3rd Energy Level
1,814.00 kJ/mol  
99+
2,150.00 kJ/mol  
99+
4th Energy Level
2,991.00 kJ/mol  
99+
3,970.00 kJ/mol  
99+
5th Energy Level
5,120.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
6th Energy Level
5,680.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
7th Energy level
5,680.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
8th Energy Level
5,680.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
9th Energy Level
5,120.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
10th Energy Level
5,120.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
11th Energy Level
5,680.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
12th Energy Level
5,680.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
13th Energy Level
5,680.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
14th Energy Level
5,680.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
15th Energy Level
56,800.00 kJ/mol  
99+
54,000.00 kJ/mol  
99+
16th Energy Level
56,800.00 kJ/mol  
99+
54,000.00 kJ/mol  
99+
17th Energy Level
568.50 kJ/mol  
99+
540.50 kJ/mol  
99+
18th Energy Level
5,680.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
19th Energy Level
568.30 kJ/mol  
99+
540.00 kJ/mol  
99+
20th Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
21st Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
22nd Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
23rd Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
24th Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
25th Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
26th Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
27th Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
28th Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
29th Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
30th Energy Level
568.00 kJ/mol  
99+
540.00 kJ/mol  
99+
Electrochemical Equivalent
1.72 g/amp-hr  
99+
1.80 g/amp-hr  
40
Electron Work Function
5.89 eV  
3
5.30 eV  
5
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
91  
27
61  
99+
Electron Configuration
[Rn] 5f2 6d1 7s2  
[Xe] 4f5 6s2  
Crystal Structure
Tetragonal (TETR)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100  
DHCP-Crystal-Structure-of-Promethium.jpg#100  
Atom
  
  
Number of Protons
91  
27
61  
99+
Number of Neutrons
122  
22
84  
99+
Number of Electrons
91  
27
61  
99+
Radius of an Atom
  
  
Atomic Radius
163.00 pm  
27
183.00 pm  
12
Covalent Radius
200.00 pm  
11
199.00 pm  
12
Van der Waals Radius
243.00 pm  
15
236.00 pm  
20
Atomic Weight
231.04 amu  
24
145.00 amu  
99+
Atomic Volume
15.00 cm3/mol  
99+
22.39 cm3/mol  
21
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Neodymium
  
Next Element
Uranium
  
Samarium
  
Valence Electron Potential
92.00 (-eV)  
11
44.10 (-eV)  
40
Lattice Constant
392.50 pm  
26
-  
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.58  
36
1.63  
14
Mechanical
Density
  
  
Density At Room Temperature
15.37 g/cm3  
20
7.26 g/cm3  
99+
Density When Liquid (at m.p.)
15.37 g/cm3  
21
7.26 g/cm3  
99+
Tensile Strength
80.00 MPa  
29
75.00 MPa  
30
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
32
0.00 (Pa)  
31
Elasticity properties
  
  
Shear Modulus
16.00 GPa  
99+
18.00 GPa  
99+
Bulk Modulus
47.00 GPa  
26
33.00 GPa  
99+
Young's Modulus
47.00 GPa  
99+
46.00 GPa  
99+
Poisson Ratio
0.23  
30
0.28  
17
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
15.37  
23
7.26  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
10
0.00 H/m  
11
Susceptibility
0.00  
21
0.00  
25
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
177.00 nΩ·m  
21
0.75 nΩ·m  
99+
Electrical Conductivity
0.05 106/cm Ω  
39
0.00 106/cm Ω  
99+
Electron Affinity
53.03 kJ/mol  
22
50.00 kJ/mol  
26
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.18 J/(kg K)  
34
Molar Heat Capacity
27.20 J/mol·K  
24
27.60 J/mol·K  
20
Thermal Conductivity
47.00 W/m·K  
32
17.90 W/m·K  
99+
Critical Temperature
1,841.00 K  
25
1,315.00 K  
99+
Thermal Expansion
9.90 µm/(m·K)  
99+
9.00 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
481.00 kJ/mol  
17
289.00 kJ/mol  
99+
Enthalpy of Fusion
12.34 kJ/mol  
34
7.50 kJ/mol  
99+
Enthalpy of Atomization
481.90 kJ/mol  
19
310.00 kJ/mol  
99+
Standard Molar Entropy
198.10 J/mol.K  
1
57.00 J/mol.K  
30
Summary >>
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