Home
 Compare Metals

Protactinium vs Osmium

Protactinium
Osmium
Osmium vs Protactinium


Periodic Table
Symbol
Pa  
Os  
Group Number
3  
15
8  
10
Period Number
7  
6  
Block
f block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
7440133  
99+
7440042  
99+
Space Group Name
I4/mmm  
P63/mmc  
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.
  
  • Osmium metal does not oxidize in air unless it is heated.
  • But if it heated den it forms Osmium Tetroxide, which is highly toxic.
  
Sources
Found in Uranium Ores, Mining, Ores of metals  
Found As a By-product, Found in Minerals, Mining  
History
  
  
Who Discovered
William Crookes  
Smithson Tennant  
Discovery
In 1900  
In 1803  
Abundance
  
  
Abundance In Universe
0.00 %  
17
0.00 %  
22
Abundance In Sun
0.00 %  
26
0.00 %  
25
Abundance In Meteorites
-  
0.00 %  
28
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
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.
  
  • Its has very limited uses and its alloys are very hard and are used in the manufacturing of pen tips, pivots, needles and electrical contacts.
  • It is also used as industrial catalyst to speed up the chemical reaction.
  
Industrial Uses
-  
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
Highly Toxic  
Highly Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,568.00 °C  
21
3,045.00 °C  
3
Boiling Point
4,027.00 °C  
12
5,027.00 °C  
6
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silvery Bluish-Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
5.00  
8
7.00  
3
Brinell Hardness
125.00 MPa  
99+
3,490.00 MPa  
1
Vickers Hardness
220.00 MPa  
99+
3,920.00 MPa  
1
Speed of Sound
12,400.00 m/s  
3
4,940.00 m/s  
15
Optical Properties
  
  
Refractive Index
1.60  
33
2.07  
12
Reflectivity
60.00 %  
23
80.00 %  
7
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Pa  
Os  
Isotopes
  
  
Known Isotopes
27  
12
35  
4
Electronegativity
  
  
Pauling Electronegativity
1.50  
28
2.20  
5
Sanderson Electronegativity
1.50  
18
2.20  
8
Allred Rochow Electronegativity
1.14  
29
1.52  
13
Mulliken-Jaffe Electronegativity
1.50  
26
2.20  
6
Allen Electronegativity
1.50  
32
1.65  
22
Electropositivity
  
  
Pauling Electropositivity
2.50  
27
1.80  
99+
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
12
2nd Energy Level
1,128.00 kJ/mol  
99+
1,309.80 kJ/mol  
99+
3rd Energy Level
1,814.00 kJ/mol  
99+
1,600.00 kJ/mol  
99+
4th Energy Level
2,991.00 kJ/mol  
99+
840.00 kJ/mol  
99+
5th Energy Level
5,120.00 kJ/mol  
99+
8,400.00 kJ/mol  
10
6th Energy Level
5,680.00 kJ/mol  
99+
8,400.00 kJ/mol  
30
7th Energy level
5,680.00 kJ/mol  
99+
8,400.00 kJ/mol  
25
8th Energy Level
5,680.00 kJ/mol  
99+
8,400.00 kJ/mol  
25
9th Energy Level
5,120.00 kJ/mol  
99+
5,280.00 kJ/mol  
99+
10th Energy Level
5,120.00 kJ/mol  
99+
8,400.00 kJ/mol  
26
11th Energy Level
5,680.00 kJ/mol  
99+
8,400.00 kJ/mol  
23
12th Energy Level
5,680.00 kJ/mol  
99+
8,400.00 kJ/mol  
99+
13th Energy Level
5,680.00 kJ/mol  
99+
8,400.00 kJ/mol  
18
14th Energy Level
5,680.00 kJ/mol  
99+
840.00 kJ/mol  
99+
15th Energy Level
56,800.00 kJ/mol  
99+
84,000.00 kJ/mol  
12
16th Energy Level
56,800.00 kJ/mol  
99+
840.00 kJ/mol  
99+
17th Energy Level
568.50 kJ/mol  
99+
840.00 kJ/mol  
29
18th Energy Level
5,680.00 kJ/mol  
99+
8,400.00 kJ/mol  
18
19th Energy Level
568.30 kJ/mol  
99+
840.00 kJ/mol  
27
20th Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
19
21st Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
39
22nd Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
15
23rd Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
99+
24th Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
11
25th Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
9
26th Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
9
27th Energy Level
568.00 kJ/mol  
99+
713.30 kJ/mol  
24
28th Energy Level
568.00 kJ/mol  
99+
840.10 kJ/mol  
13
29th Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
13
30th Energy Level
568.00 kJ/mol  
99+
840.00 kJ/mol  
9
Electrochemical Equivalent
1.72 g/amp-hr  
99+
1.77 g/amp-hr  
99+
Electron Work Function
5.89 eV  
3
4.83 eV  
13
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Chemical Stability, Ionization, Solubility  
Atomic
Atomic Number
91  
27
76  
40
Electron Configuration
[Rn] 5f2 6d1 7s2  
[Xe] 4f14 5d6 6s2  
Crystal Structure
Tetragonal (TETR)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
91  
27
76  
39
Number of Neutrons
122  
22
114  
26
Number of Electrons
91  
27
76  
39
Radius of an Atom
  
  
Atomic Radius
163.00 pm  
27
133.80 pm  
99+
Covalent Radius
200.00 pm  
11
128.00 pm  
99+
Van der Waals Radius
243.00 pm  
15
216.00 pm  
30
Atomic Weight
231.04 amu  
24
190.23 amu  
35
Atomic Volume
15.00 cm3/mol  
99+
8.49 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Rhenium
  
Next Element
Uranium
  
Iridium
  
Valence Electron Potential
92.00 (-eV)  
11
91.40 (-eV)  
12
Lattice Constant
392.50 pm  
26
273.44 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.58  
36
1.58  
37
Mechanical
Density
  
  
Density At Room Temperature
15.37 g/cm3  
20
22.59 g/cm3  
9
Density When Liquid (at m.p.)
15.37 g/cm3  
21
20.00 g/cm3  
11
Tensile Strength
80.00 MPa  
29
1,000.00 MPa  
4
Viscosity
0.00  
25
0.00  
3
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
16
Vapor Pressure at 2000 K
0.00 (Pa)  
32
0.00 (Pa)  
39
Elasticity properties
  
  
Shear Modulus
16.00 GPa  
99+
222.00 GPa  
1
Bulk Modulus
47.00 GPa  
26
462.00 GPa  
1
Young's Modulus
47.00 GPa  
99+
528.00 GPa  
1
Poisson Ratio
0.23  
30
0.25  
24
Other Mechanical Properties
-  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
15.37  
23
22.57  
11
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
10
0.00 H/m  
17
Susceptibility
0.00  
21
0.00  
17
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
177.00 nΩ·m  
21
81.20 nΩ·m  
35
Electrical Conductivity
0.05 106/cm Ω  
39
0.11 106/cm Ω  
21
Electron Affinity
53.03 kJ/mol  
22
106.10 kJ/mol  
10
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.13 J/(kg K)  
40
Molar Heat Capacity
27.20 J/mol·K  
24
24.70 J/mol·K  
99+
Thermal Conductivity
47.00 W/m·K  
32
87.60 W/m·K  
19
Critical Temperature
1,841.00 K  
25
3,300.00 K  
3
Thermal Expansion
9.90 µm/(m·K)  
99+
5.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
481.00 kJ/mol  
17
627.60 kJ/mol  
8
Enthalpy of Fusion
12.34 kJ/mol  
34
29.30 kJ/mol  
4
Enthalpy of Atomization
481.90 kJ/mol  
19
669.00 kJ/mol  
6
Standard Molar Entropy
198.10 J/mol.K  
1
32.60 J/mol.K  
99+
Periodic Table >>
<< All

Compare Actinide Series

Actinide Series

Actinide Series

» More Actinide Series

Compare Actinide Series

» More Compare Actinide Series
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!