Iridium vs Curium
Periodic Table
Symbol
Ir
Cm
Group Number
9
9
Not Available
Period Number
6
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
7439885
99+
7440519
36
Space Group Name
Fm_ 3m
Not Available
Space Group Number
225.00
2
Not Available
Facts
Interesting Facts
- Iridium element occurs as natural alloys of Platinum and Osmium.
- Iridium element is known as the most corrosion resistance metal .
- Curium metal does not occur free in nature.
- Curium metal is a synthetically produced metal.
Sources
Found in Minerals, Mining, Ores of Minerals
Bombarding Plutonium with Helium Ions
History
Who Discovered
Smithson Tennant
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Discovery
In 1803
In 1944
Abundance
Abundance In Universe
2 * 10-7 %
22
Not Available
Abundance In Sun
~0.0000002 %
25
~-9999 %
Abundance In Meteorites
0.00 %
29
Not Available
Abundance In Earth's Crust
0.00 %
99+
Not Available
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.
- Curium metal is used to provide power to electrical equipment for space missions.
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry
NA
Medical Uses
NA
NA
Other Uses
Alloys
Research Purposes
Biological Properties
Toxicity
Toxic
Unknown
Present in Human Body
Yes
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
2,410.00 °C
7
1,340.00 °C
34
Boiling Point
4,527.00 °C
10
3,110.00 °C
30
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silver
Luster
Metallic
Metallic
Hardness
Mohs Hardness
6.50
5
Not Available
Brinell Hardness
1,670.00 MPa
5
Not Available
Vickers Hardness
1,760.00 MPa
3
Not Available
Speed of Sound
4,825.00 m/s
13
Not Available
Optical Properties
Reflectivity
78.00 %
6
Not Available
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
Cm
Isotopes
Known Isotopes
34
5
15
24
Electronegativity
Pauling Electronegativity
2.20
4
1.30
32
Allred Rochow Electronegativity
1.55
11
1.20
27
Allen Electronegativity
1.68
17
Not Available
Electropositivity
Pauling Electropositivity
1.80
99+
2.70
22
Ionization Energies
1st Energy Level
880.00 kJ/mol
9
581.00 kJ/mol
99+
2nd Energy Level
1,600.00 kJ/mol
35
1,196.00 kJ/mol
99+
3rd Energy Level
Not Available
2,026.00 kJ/mol
99+
4th Energy Level
Not Available
3,550.00 kJ/mol
99+
Electrochemical Equivalent
1.14 g/amp-hr
99+
3.07 g/amp-hr
16
Electron Work Function
4.55 eV
13
Not Available
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
77
39
96
22
Electron Configuration
[Xe] 4f14 5d7 6s2
[Rn] 5f7 6d1 7s2
Crystal Structure
Face Centered Cubic (FCC)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100
DHCP-Crystal-Structure-of-Curium.jpg#100
Atom
Number of Protons
74
99+
96
22
Number of Neutrons
110
27
151
10
Number of Electrons
74
99+
96
22
Radius of an Atom
Atomic Radius
136.00 pm
99+
174.00 pm
20
Covalent Radius
141.00 pm
99+
169.00 pm
26
Van der Waals Radius
202.00 pm
27
200.00 pm
28
Atomic Weight
192.22 amu
34
247.00 amu
18
Atomic Volume
9.53 cm3/mol
99+
18.28 cm3/mol
26
Adjacent Atomic Numbers
Valence Electron Potential
140.00 (-eV)
5
44.50 (-eV)
38
Lattice Constant
383.90 pm
26
Not Available
Lattice Angles
π/2, π/2, π/2
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
22.56 g/cm3
10
13.51 g/cm3
25
Density When Liquid (at m.p.)
19.00 g/cm3
3
13.85 g/cm3
10
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
Not Available
Elasticity properties
Shear Modulus
210.00 GPa
2
Not Available
Bulk Modulus
320.00 GPa
3
Not Available
Young's Modulus
528.00 GPa
1
Not Available
Poisson Ratio
0.26
22
Not Available
Other Mechanical Properties
NA
Unknown
Magnetic Properties
Magnetic Characteristics
Specific Gravity
21.78
3
13.51
17
Magnetic Ordering
Paramagnetic
Antiferromagnetic
Electrical Properties
Electrical Property
Conductor
Unknown
Resistivity
47.10 nΩ·m
99+
1.25 nΩ·m
99+
Electrical Conductivity
0.19 106/cm Ω
10
Not Available
Electron Affinity
151.00 kJ/mol
4
Not Available
Thermal Properties
Specific Heat
0.13 J/(kg K)
39
Not Available
Molar Heat Capacity
25.10 J/mol·K
99+
Not Available
Thermal Conductivity
147.00 W/m·K
10
Not Available
Critical Temperature
Not Available
Not Available
Thermal Expansion
6.40 µm/(m·K)
99+
Not Available
Enthalpy
Enthalpy of Vaporization
799.10 kJ/mol
1
Not Available
Enthalpy of Fusion
35.23 kJ/mol
1
15.00 kJ/mol
21
Enthalpy of Atomization
837.00 kJ/mol
1
Not Available
Standard Molar Entropy
35.50 J/mol.K
99+
Not Available
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