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Osmium vs Actinium

Osmium
Actinium
Actinium vs Osmium


Periodic Table
Symbol
Os   
Ac   
Group Number
8   
10
Not Available   
Period Number
6   
7   
Block
d block   
f block   
Element Family
Transition Metal   
Actinide   
CAS Number
7440042   
99+
7440348   
99+
Space Group Name
P63/mmc   
Fm_ 3m   
Space Group Number
194.00   
5
225.00   
2
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.
  
Not Available   
Sources
Found As a By-product, Found in Minerals, Mining   
Obtained by Treating Radium with Neutrons, Ores of metals   
History
  
  
Who Discovered
Smithson Tennant   
Friedrich Oskar Giesel   
Discovery
In 1803   
In 1902   
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+
Not Available   
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.
  
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Highly Toxic   
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
1,227.00 °C   
38
Boiling Point
5,027.00 °C   
6
3,200.00 °C   
26
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Bluish-Gray   
Silvery White   
Luster
Metallic   
NA   
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   
Ac   
Isotopes
  
  
Known Isotopes
35   
4
29   
10
Electronegativity
  
  
Pauling Electronegativity
2.20   
4
1.10   
99+
Allred Rochow Electronegativity
1.52   
12
1.00   
36
Allen Electronegativity
1.65   
19
Not Available   
Electropositivity
  
  
Pauling Electropositivity
1.80   
99+
2.90   
10
Ionization Energies
  
  
1st Energy Level
840.00 kJ/mol   
12
499.00 kJ/mol   
99+
2nd Energy Level
1,309.80 kJ/mol   
99+
1,170.00 kJ/mol   
99+
3rd Energy Level
1,600.00 kJ/mol   
99+
1,900.00 kJ/mol   
99+
4th Energy Level
Not Available   
4,700.00 kJ/mol   
23
Electrochemical Equivalent
1.77 g/amp-hr   
38
2.82 g/amp-hr   
18
Electron Work Function
4.83 eV   
8
Not Available   
Other Chemical Properties
Chemical Stability, Ionization, Solubility   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
76   
40
89   
29
Electron Configuration
[Xe] 4f14 5d6 6s2   
[Rn] 6d1 7s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Face Centered Cubic (FCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Actinium.jpg#100   
Atom
  
  
Number of Protons
76   
39
89   
29
Number of Neutrons
114   
25
138   
16
Number of Electrons
76   
39
89   
29
Radius of an Atom
  
  
Atomic Radius
133.80 pm   
99+
195.00 pm   
7
Van der Waals Radius
216.00 pm   
24
Not Available   
Atomic Weight
190.23 amu   
35
227.00 amu   
25
Atomic Volume
8.49 cm3/mol   
99+
22.54 cm3/mol   
11
Adjacent Atomic Numbers
  
  
Previous Element
Rhenium
  
Radium
  
Next Element
Iridium
  
Thorium
  
Valence Electron Potential
91.40 (-eV)   
12
38.60 (-eV)   
99+
Lattice Constant
273.44 pm   
99+
567.00 pm   
8
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
10.00 g/cm3   
37
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   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
22.57   
2
10.07   
28
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Unknown   
Resistivity
81.20 nΩ·m   
35
Not Available   
Electrical Conductivity
0.11 106/cm Ω   
18
Not Available   
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+
27.20 J/mol·K   
18
Thermal Conductivity
87.60 W/m·K   
19
12.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
5.10 µm/(m·K)   
99+
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
627.60 kJ/mol   
7
Not Available   
Enthalpy of Fusion
29.30 kJ/mol   
4
Not Available   
Enthalpy of Atomization
669.00 kJ/mol   
6
301.00 kJ/mol   
36
Standard Molar Entropy
32.60 J/mol.K   
99+
56.50 J/mol.K   
25
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