Iridium Tantalum Comparison
Periodic Table
Symbol
Ir
Ta
Group Number
9
9
5
13
Period Number
6
6
Block
d block
d block
Element Family
Transition Metal
Transition Metal
CAS Number
7439885
99+
7440257
99+
Space Group Name
Fm_ 3m
Im_ 3m
Space Group Number
225.00
2
229.00
1
Facts
Interesting Facts
- Iridium element occurs as natural alloys of Platinum and Osmium.
- Iridium element is known as the most corrosion resistance metal .
- Tantalum metal is known as corrosion resistance.
- Tantalum metal can easily fabricated and It is a good conductor of heat and electricity.
Sources
Found in Minerals, Mining, Ores of Minerals
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Smithson Tennant
Anders Gustaf Ekeberg
Discovery
In 1803
In 1802
Abundance
Abundance In Universe
2 * 10-7 %
22
8 * 10-9 %
31
Abundance In Sun
~0.0000002 %
25
~-9999 %
Abundance In Meteorites
0.00 %
29
0.00 %
99+
Abundance In Earth's Crust
0.00 %
99+
0.00 %
37
Abundance In Oceans
Not Available
0.00 %
31
Uses
Uses & Benefits
- Iridium has an anti corrosion properties and it is used in special alloy with Osmium metal and that alloy is used in pen tips and compass bearings.
- Tantalum metal is mainly used in the manufacturing of electron components. Its Oxide layer acts as an insulator.
- Tantalum metal is also used in surgical transplant like replacement of bone, skull plates and as a woven gauze.
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry
Electrical Industry, Electronic Industry
Medical Uses
NA
NA
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Toxic
Low Toxic
Present in Human Body
Yes
Yes
In Bone
Not Available
0.03 p.p.m.
28
Physical Properties
Melting Point
2,410.00 °C
7
2,996.00 °C
4
Boiling Point
4,527.00 °C
10
5,425.00 °C
4
Appearance
Physical State
Solid
Solid
Color
Silvery White
Gray Blue
Luster
Metallic
Metallic
Hardness
Mohs Hardness
6.50
5
6.50
5
Brinell Hardness
1,670.00 MPa
5
440.00 MPa
28
Vickers Hardness
1,760.00 MPa
3
870.00 MPa
12
Speed of Sound
4,825.00 m/s
13
3,400.00 m/s
22
Optical Properties
Reflectivity
78.00 %
6
78.00 %
6
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
Ir
Ta
Isotopes
Known Isotopes
34
5
31
8
Electronegativity
Pauling Electronegativity
2.20
4
1.50
27
Allred Rochow Electronegativity
1.55
11
1.33
22
Allen Electronegativity
1.68
17
1.34
33
Electropositivity
Pauling Electropositivity
1.80
99+
2.50
27
Ionization Energies
1st Energy Level
880.00 kJ/mol
9
761.00 kJ/mol
18
2nd Energy Level
1,600.00 kJ/mol
35
1,500.00 kJ/mol
40
Electrochemical Equivalent
1.14 g/amp-hr
99+
1.35 g/amp-hr
99+
Electron Work Function
4.55 eV
13
4.25 eV
21
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
77
39
73
99+
Electron Configuration
[Xe] 4f14 5d7 6s2
[Xe] 4f14 5d3 6s2
Crystal Structure
Face Centered Cubic (FCC)
Body Centered Cubic (BCC)
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
74
99+
73
99+
Number of Neutrons
110
27
108
28
Number of Electrons
74
99+
73
99+
Radius of an Atom
Atomic Radius
136.00 pm
99+
146.00 pm
35
Covalent Radius
141.00 pm
99+
170.00 pm
25
Van der Waals Radius
202.00 pm
27
200.00 pm
28
Atomic Weight
192.22 amu
34
180.95 amu
38
Atomic Volume
9.53 cm3/mol
99+
10.90 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
140.00 (-eV)
5
110.00 (-eV)
7
Lattice Constant
383.90 pm
26
330.13 pm
99+
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
22.56 g/cm3
10
16.69 g/cm3
18
Density When Liquid (at m.p.)
19.00 g/cm3
3
15.00 g/cm3
9
Tensile Strength
2,000.00 MPa
2
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
0.00 (Pa)
25
0.00 (Pa)
31
Elasticity properties
Shear Modulus
210.00 GPa
2
69.00 GPa
13
Bulk Modulus
320.00 GPa
3
200.00 GPa
8
Young's Modulus
528.00 GPa
1
186.00 GPa
13
Poisson Ratio
0.26
22
0.34
10
Other Mechanical Properties
NA
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
21.78
3
16.65
11
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
47.10 nΩ·m
99+
131.00 nΩ·m
25
Electrical Conductivity
0.19 106/cm Ω
10
0.08 106/cm Ω
27
Electron Affinity
151.00 kJ/mol
4
31.00 kJ/mol
29
Thermal Properties
Specific Heat
0.13 J/(kg K)
39
0.14 J/(kg K)
37
Molar Heat Capacity
25.10 J/mol·K
99+
25.36 J/mol·K
99+
Thermal Conductivity
147.00 W/m·K
10
57.50 W/m·K
27
Critical Temperature
Not Available
Not Available
Thermal Expansion
6.40 µm/(m·K)
99+
6.30 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
799.10 kJ/mol
1
753.10 kJ/mol
2
Enthalpy of Fusion
35.23 kJ/mol
1
31.40 kJ/mol
3
Enthalpy of Atomization
837.00 kJ/mol
1
782.00 kJ/mol
3
Standard Molar Entropy
35.50 J/mol.K
99+
41.50 J/mol.K
37
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