Radium Iridium Comparison
Periodic Table
Symbol
Ra
Ir
Group Number
2
16
9
9
Period Number
7
6
Block
s block
d block
Element Family
Alkaline Earth
Transition Metal
CAS Number
7440144
99+
7439885
99+
Space Group Name
Im_ 3m
Fm_ 3m
Space Group Number
229.00
1
225.00
2
Facts
Interesting Facts
- Radium metal is the heaviest metal of Alkaline earth metals column.
- Radium metal is highly radioactive and does not have any stable isotopes.
- Iridium element occurs as natural alloys of Platinum and Osmium.
- Iridium element is known as the most corrosion resistance metal .
Sources
Mining, Ores of metals
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Not Available
Smithson Tennant
Discovery
In 1898
In 1803
Abundance
Abundance In Universe
Not Available
2 * 10-7 %
22
Abundance In Sun
~-9999 %
~0.0000002 %
25
Abundance In Meteorites
Not Available
0.00 %
29
Abundance In Earth's Crust
0.00 %
99+
0.00 %
99+
Abundance In Oceans
0.00 %
99+
Not Available
Abundance In Humans
0.00 %
20
Not Available
Uses
Uses & Benefits
- It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
- It is used in luminous paints.
- 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.
Industrial Uses
NA
Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
Pharmaceutical Industry
NA
Other Uses
NA
Alloys
Biological Properties
Toxicity
Highly Toxic
Toxic
Present in Human Body
No
Yes
Physical Properties
Melting Point
700.00 °C
99+
2,410.00 °C
7
Boiling Point
1,737.00 °C
99+
4,527.00 °C
10
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery White
Luster
Metallic
Metallic
Hardness
Mohs Hardness
Not Available
6.50
5
Brinell Hardness
Not Available
1,670.00 MPa
5
Vickers Hardness
Not Available
1,760.00 MPa
3
Speed of Sound
Not Available
4,825.00 m/s
13
Optical Properties
Reflectivity
Not Available
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
Ra
Ir
Isotopes
Known Isotopes
33
6
34
5
Electronegativity
Pauling Electronegativity
0.90
99+
2.20
4
Allred Rochow Electronegativity
0.97
38
1.55
11
Mulliken-Jaffe Electronegativity
0.92
20
Not Available
Allen Electronegativity
0.89
99+
1.68
17
Electropositivity
Pauling Electropositivity
3.10
5
1.80
99+
Ionization Energies
1st Energy Level
509.30 kJ/mol
99+
880.00 kJ/mol
9
2nd Energy Level
979.00 kJ/mol
99+
1,600.00 kJ/mol
35
Electrochemical Equivalent
4.22 g/amp-hr
6
1.14 g/amp-hr
99+
Electron Work Function
Not Available
4.55 eV
13
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Flammable, Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
88
30
77
39
Electron Configuration
[Rn] 7s2
[Xe] 4f14 5d7 6s2
Crystal Structure
Body Centered Cubic (BCC)
Face Centered Cubic (FCC)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
FCC-Crystal-Structure-of-Iridium.jpg#100
Atom
Number of Protons
88
30
74
99+
Number of Neutrons
138
16
110
27
Number of Electrons
88
30
74
99+
Radius of an Atom
Atomic Radius
Not Available
136.00 pm
99+
Covalent Radius
221.00 pm
3
141.00 pm
99+
Van der Waals Radius
283.00 pm
4
202.00 pm
27
Atomic Weight
226.00 amu
26
192.22 amu
34
Atomic Volume
45.20 cm3/mol
4
9.53 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
20.10 (-eV)
99+
140.00 (-eV)
5
Lattice Constant
514.80 pm
13
383.90 pm
26
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
5.50 g/cm3
99+
22.56 g/cm3
10
Density When Liquid (at m.p.)
Not Available
19.00 g/cm3
3
Tensile Strength
Not Available
2,000.00 MPa
2
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
Not Available
0.00 (Pa)
25
Elasticity properties
Shear Modulus
Not Available
210.00 GPa
2
Bulk Modulus
Not Available
320.00 GPa
3
Young's Modulus
Not Available
528.00 GPa
1
Poisson Ratio
Not Available
0.26
22
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
5.00
99+
21.78
3
Magnetic Ordering
Nonmagnetic
Paramagnetic
Electrical Properties
Electrical Property
NA
Conductor
Resistivity
100.00 nΩ·m
31
47.10 nΩ·m
99+
Electrical Conductivity
Not Available
0.19 106/cm Ω
10
Electron Affinity
Not Available
151.00 kJ/mol
4
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
0.13 J/(kg K)
39
Molar Heat Capacity
Not Available
25.10 J/mol·K
99+
Thermal Conductivity
18.60 W/m·K
99+
147.00 W/m·K
10
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
6.40 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
Not Available
799.10 kJ/mol
1
Enthalpy of Fusion
Not Available
35.23 kJ/mol
1
Enthalpy of Atomization
163.00 kJ/mol
99+
837.00 kJ/mol
1
Standard Molar Entropy
71.00 J/mol.K
14
35.50 J/mol.K
99+
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