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Protactinium vs Samarium

Protactinium
Samarium
Samarium vs Protactinium


Periodic Table
Symbol
Pa  
Sm  
Group Number
3  
15
3  
15
Period Number
7  
6  
Block
f block  
f block  
Element Family
Actinide  
Lanthanide  
CAS Number
7440133  
99+
7440199  
99+
Space Group Name
I4/mmm  
R_ 3m  
Space Group Number
139.00  
11
166.00  
9
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
Sources
Found in Uranium Ores, Mining, Ores of metals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
William Crookes  
Lecoq de Boisbaudran  
Discovery
In 1900  
In 1879  
Abundance
  
  
Abundance In Universe
0.00 %  
17
0.00 %  
20
Abundance In Sun
0.00 %  
26
0.00 %  
26
Abundance In Meteorites
-  
0.00 %  
37
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
29
Abundance In Oceans
0.00 %  
99+
0.00 %  
40
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • Magnets of Samarium cobalt alloy are stronger than that of Iron and hence, they are used in microwave application.
  • Samarium metal also used in optical lasers and infrared absorbing glasses and as a neutron absorber.
  
Industrial Uses
-  
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
-  
Alloys, In Nuclear Reactors  
Biological Properties
  
  
Toxicity
Highly Toxic  
Slightly Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.01 Blood/mg dm-3  
22
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,568.00 °C  
21
1,072.00 °C  
99+
Boiling Point
4,027.00 °C  
12
1,900.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silvery White  
Luster
Metallic  
Lustrous  
Hardness
  
  
Mohs Hardness
5.00  
8
5.50  
7
Brinell Hardness
125.00 MPa  
99+
441.00 MPa  
32
Vickers Hardness
220.00 MPa  
99+
412.00 MPa  
40
Speed of Sound
12,400.00 m/s  
3
2,130.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.60  
33
1.80  
22
Reflectivity
60.00 %  
23
65.00 %  
18
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Pa  
Sm  
Isotopes
  
  
Known Isotopes
27  
12
30  
9
Electronegativity
  
  
Pauling Electronegativity
1.50  
28
1.17  
99+
Sanderson Electronegativity
1.50  
18
1.17  
33
Allred Rochow Electronegativity
1.14  
29
1.07  
33
Mulliken-Jaffe Electronegativity
1.50  
26
1.17  
40
Allen Electronegativity
1.50  
32
1.17  
99+
Electropositivity
  
  
Pauling Electropositivity
2.50  
27
2.83  
14
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol  
99+
544.50 kJ/mol  
99+
2nd Energy Level
1,128.00 kJ/mol  
99+
1,070.00 kJ/mol  
99+
3rd Energy Level
1,814.00 kJ/mol  
99+
2,260.00 kJ/mol  
99+
4th Energy Level
2,991.00 kJ/mol  
99+
3,990.00 kJ/mol  
99+
5th Energy Level
5,120.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
6th Energy Level
5,680.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
7th Energy level
5,680.00 kJ/mol  
99+
5,445.00 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+
5,440.00 kJ/mol  
99+
10th Energy Level
5,120.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
11th Energy Level
5,680.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
12th Energy Level
5,680.00 kJ/mol  
99+
5,440.00 kJ/mol  
99+
13th Energy Level
5,680.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
14th Energy Level
5,680.00 kJ/mol  
99+
5,450.00 kJ/mol  
99+
15th Energy Level
56,800.00 kJ/mol  
99+
54,450.00 kJ/mol  
99+
16th Energy Level
56,800.00 kJ/mol  
99+
54,400.00 kJ/mol  
99+
17th Energy Level
568.50 kJ/mol  
99+
544.50 kJ/mol  
99+
18th Energy Level
5,680.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
19th Energy Level
568.30 kJ/mol  
99+
544.50 kJ/mol  
99+
20th Energy Level
568.00 kJ/mol  
99+
624.00 kJ/mol  
99+
21st Energy Level
568.00 kJ/mol  
99+
544.50 kJ/mol  
99+
22nd Energy Level
568.00 kJ/mol  
99+
624.00 kJ/mol  
37
23rd Energy Level
568.00 kJ/mol  
99+
544.50 kJ/mol  
99+
24th Energy Level
568.00 kJ/mol  
99+
544.50 kJ/mol  
99+
25th Energy Level
568.00 kJ/mol  
99+
544.00 kJ/mol  
99+
26th Energy Level
568.00 kJ/mol  
99+
544.50 kJ/mol  
99+
27th Energy Level
568.00 kJ/mol  
99+
544.50 kJ/mol  
99+
28th Energy Level
568.00 kJ/mol  
99+
544.50 kJ/mol  
99+
29th Energy Level
568.00 kJ/mol  
99+
544.50 kJ/mol  
99+
30th Energy Level
568.00 kJ/mol  
99+
544.00 kJ/mol  
99+
Electrochemical Equivalent
1.72 g/amp-hr  
99+
1.87 g/amp-hr  
38
Electron Work Function
5.89 eV  
3
2.70 eV  
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
91  
27
62  
99+
Electron Configuration
[Rn] 5f2 6d1 7s2  
[Xe] 4f6 6s2  
Crystal Structure
Tetragonal (TETR)  
Rhombohedral (RHO)  
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100  
RHO-Crystal-Structure-of-Samarium.jpg#100  
Atom
  
  
Number of Protons
91  
27
62  
99+
Number of Neutrons
122  
22
88  
40
Number of Electrons
91  
27
62  
99+
Radius of an Atom
  
  
Atomic Radius
163.00 pm  
27
180.00 pm  
16
Covalent Radius
200.00 pm  
11
198.00 pm  
13
Van der Waals Radius
243.00 pm  
15
229.00 pm  
25
Atomic Weight
231.04 amu  
24
150.36 amu  
99+
Atomic Volume
15.00 cm3/mol  
99+
19.95 cm3/mol  
31
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Promethium
  
Next Element
Uranium
  
Europium
  
Valence Electron Potential
92.00 (-eV)  
11
44.80 (-eV)  
38
Lattice Constant
392.50 pm  
26
362.10 pm  
37
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.58  
36
1.62  
15
Mechanical
Density
  
  
Density At Room Temperature
15.37 g/cm3  
20
7.52 g/cm3  
99+
Density When Liquid (at m.p.)
15.37 g/cm3  
21
7.16 g/cm3  
99+
Tensile Strength
80.00 MPa  
29
50.00 MPa  
38
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.94 (Pa)  
9
Vapor Pressure at 2000 K
0.00 (Pa)  
32
0.00 (Pa)  
29
Elasticity properties
  
  
Shear Modulus
16.00 GPa  
99+
19.50 GPa  
99+
Bulk Modulus
47.00 GPa  
26
37.80 GPa  
99+
Young's Modulus
47.00 GPa  
99+
49.70 GPa  
40
Poisson Ratio
0.23  
30
0.27  
19
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
15.37  
23
7.52  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
10
0.00 H/m  
9
Susceptibility
0.00  
21
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
177.00 nΩ·m  
21
0.94 nΩ·m  
99+
Electrical Conductivity
0.05 106/cm Ω  
39
0.01 106/cm Ω  
99+
Electron Affinity
53.03 kJ/mol  
22
50.00 kJ/mol  
26
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.20 J/(kg K)  
32
Molar Heat Capacity
27.20 J/mol·K  
24
29.54 J/mol·K  
9
Thermal Conductivity
47.00 W/m·K  
32
13.30 W/m·K  
99+
Critical Temperature
1,841.00 K  
25
1,345.00 K  
99+
Thermal Expansion
9.90 µm/(m·K)  
99+
12.70 µm/(m·K)  
39
Enthalpy
  
  
Enthalpy of Vaporization
481.00 kJ/mol  
17
166.40 kJ/mol  
99+
Enthalpy of Fusion
12.34 kJ/mol  
34
8.62 kJ/mol  
99+
Enthalpy of Atomization
481.90 kJ/mol  
19
209.00 kJ/mol  
99+
Standard Molar Entropy
198.10 J/mol.K  
1
69.60 J/mol.K  
15
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