Osmium Protactinium Comparison
Periodic Table
Symbol
Os
Pa
Group Number
8
10
Not Available
Period Number
6
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
7440042
99+
7440133
99+
Space Group Name
P63/mmc
I4/mmm
Space Group Number
194.00
5
139.00
8
Facts
Interesting Facts
- Osmium metal does not oxidize in air unless it is heated.
- But if it heated den it forms Osmium Tetroxide, which is highly toxic.
- Protactinium metal has 29 isotopes.
- Isotopes of Protactinium-231 used in nuclear weapon.
Sources
Found As a By-product, Found in Minerals, Mining
Found in Uranium Ores, Mining, Ores of metals
History
Who Discovered
Smithson Tennant
William Crookes
Discovery
In 1803
In 1900
Abundance
Abundance In Universe
3 * 10-7 %
21
Not Available
Abundance In Sun
~0.0000002 %
25
~-9999 %
Abundance In Meteorites
0.00 %
28
Not Available
Abundance In Earth's Crust
0.00 %
99+
0.00 %
99+
Abundance In Oceans
Not Available
0.00 %
99+
Uses
Uses & Benefits
- 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.
- Currently known uses of Protactinium metal are limited to research purpose only.
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
NA
Medical Uses
NA
NA
Other Uses
Alloys
NA
Biological Properties
Toxicity
Highly Toxic
Highly Toxic
Present in Human Body
No
No
In Blood
Not Available
0.00 Blood/mg dm-3
37
In Bone
Not Available
0.00 p.p.m.
36
Physical Properties
Melting Point
3,045.00 °C
3
1,568.00 °C
21
Boiling Point
5,027.00 °C
6
4,027.00 °C
12
Appearance
Physical State
Solid
Solid
Color
Silvery Bluish-Gray
Silver
Luster
Metallic
Metallic
Hardness
Mohs Hardness
7.00
3
Not Available
Brinell Hardness
3,490.00 MPa
1
Not Available
Speed of Sound
4,940.00 m/s
11
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
Os
Pa
Isotopes
Known Isotopes
35
4
27
12
Electronegativity
Pauling Electronegativity
2.20
4
1.50
27
Allred Rochow Electronegativity
1.52
12
1.14
28
Allen Electronegativity
1.65
19
Not Available
Electropositivity
Pauling Electropositivity
1.80
99+
2.50
27
Ionization Energies
1st Energy Level
840.00 kJ/mol
12
568.00 kJ/mol
99+
2nd Energy Level
1,309.80 kJ/mol
99+
1,128.00 kJ/mol
99+
3rd Energy Level
1,600.00 kJ/mol
99+
1,814.00 kJ/mol
99+
4th Energy Level
Not Available
2,991.00 kJ/mol
99+
Electrochemical Equivalent
1.77 g/amp-hr
38
1.72 g/amp-hr
99+
Electron Work Function
4.83 eV
8
Not Available
Other Chemical Properties
Chemical Stability, Ionization, Solubility
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
76
40
91
27
Electron Configuration
[Xe] 4f14 5d6 6s2
[Rn] 5f2 6d1 7s2
Crystal Structure
Hexagonal Close Packed (HCP)
Tetragonal (TETR)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
TETR-Crystal-Structure-of-Protactinium.jpg#100
Atom
Number of Protons
76
39
91
27
Number of Neutrons
114
25
122
21
Number of Electrons
76
39
91
27
Radius of an Atom
Atomic Radius
133.80 pm
99+
163.00 pm
25
Covalent Radius
Not Available
200.00 pm
11
Van der Waals Radius
216.00 pm
24
243.00 pm
11
Atomic Weight
190.23 amu
35
231.04 amu
24
Atomic Volume
8.49 cm3/mol
99+
15.00 cm3/mol
34
Adjacent Atomic Numbers
Valence Electron Potential
91.40 (-eV)
12
92.00 (-eV)
11
Lattice Constant
273.44 pm
99+
392.50 pm
23
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
1.58
14
Not Available
Mechanical Properties
Density
Density At Room Temperature
22.59 g/cm3
9
15.37 g/cm3
20
Density When Liquid (at m.p.)
20.00 g/cm3
1
Not Available
Tensile Strength
1,000.00 MPa
4
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
0.00 (Pa)
28
Not Available
Elasticity properties
Shear Modulus
222.00 GPa
1
Not Available
Bulk Modulus
462.00 GPa
1
Not Available
Poisson Ratio
0.25
24
Not Available
Other Mechanical Properties
Ductile
Unknown
Magnetic Properties
Magnetic Characteristics
Specific Gravity
22.57
2
15.37
12
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
81.20 nΩ·m
35
177.00 nΩ·m
21
Electrical Conductivity
0.11 106/cm Ω
18
0.05 106/cm Ω
34
Electron Affinity
106.10 kJ/mol
9
Not Available
Thermal Properties
Specific Heat
0.13 J/(kg K)
39
0.12 J/(kg K)
40
Molar Heat Capacity
24.70 J/mol·K
99+
Not Available
Thermal Conductivity
87.60 W/m·K
19
47.00 W/m·K
32
Critical Temperature
Not Available
Not Available
Thermal Expansion
5.10 µm/(m·K)
99+
9.90 µm/(m·K)
40
Enthalpy
Enthalpy of Vaporization
627.60 kJ/mol
7
Not Available
Enthalpy of Fusion
29.30 kJ/mol
4
12.34 kJ/mol
28
Enthalpy of Atomization
669.00 kJ/mol
6
Not Available
Standard Molar Entropy
32.60 J/mol.K
99+
198.10 J/mol.K
1
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