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Iridium vs Roentgenium

Iridium
Roentgenium
Roentgenium vs Iridium


Periodic Table
Symbol
Ir  
Rg  
Group Number
9  
9
11  
7
Period Number
6  
7  
Block
d block  
d block  
Element Family
Transition Metal  
-  
CAS Number
7439885  
99+
54386242  
1
Space Group Name
Fm_ 3m  
-  
Space Group Number
225.00  
3
194.00  
7
Facts
Interesting Facts
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
Roentgenium is a highly unstable synthetic element.  
Sources
Found in Minerals, Mining, Ores of Minerals  
Synthetically Produced  
History
  
  
Who Discovered
Smithson Tennant  
Gesellschaft für Schwerionenforschung  
Discovery
In 1803  
In 1994  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
40
Abundance In Sun
0.00 %  
25
-  
Abundance In Meteorites
0.00 %  
29
-  
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
-  
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.
  
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Research Purposes  
Biological Properties
  
  
Toxicity
Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
2,410.00 °C  
7
-  
Boiling Point
4,527.00 °C  
10
2,800.00 °C  
38
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
Unknown Luster  
Hardness
  
  
Mohs Hardness
6.50  
5
-  
Brinell Hardness
1,670.00 MPa  
5
700.00 MPa  
17
Vickers Hardness
1,760.00 MPa  
8
450.00 MPa  
38
Speed of Sound
4,825.00 m/s  
17
3,430.00 m/s  
32
Optical Properties
  
  
Refractive Index
2.40  
7
1.30  
99+
Reflectivity
78.00 %  
8
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ir  
Rg  
Isotopes
  
  
Known Isotopes
34  
5
1  
34
Electronegativity
  
  
Pauling Electronegativity
2.20  
5
0.00  
99+
Sanderson Electronegativity
2.20  
8
1.90  
13
Allred Rochow Electronegativity
1.55  
12
1.30  
25
Mulliken-Jaffe Electronegativity
2.20  
6
0.90  
99+
Allen Electronegativity
1.68  
20
0.80  
99+
Electropositivity
  
  
Pauling Electropositivity
1.80  
99+
2.20  
39
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol  
9
1,022.70 kJ/mol  
3
2nd Energy Level
1,600.00 kJ/mol  
36
2,074.40 kJ/mol  
10
3rd Energy Level
2,256.10 kJ/mol  
99+
3,077.90 kJ/mol  
24
4th Energy Level
880.00 kJ/mol  
99+
4,052.40 kJ/mol  
99+
5th Energy Level
8,800.00 kJ/mol  
8
5,306.70 kJ/mol  
99+
6th Energy Level
8,800.00 kJ/mol  
25
11,100.00 kJ/mol  
10
7th Energy level
8,800.00 kJ/mol  
22
5,800.00 kJ/mol  
99+
8th Energy Level
8,800.00 kJ/mol  
22
5,800.00 kJ/mol  
99+
9th Energy Level
8,800.00 kJ/mol  
21
5,650.00 kJ/mol  
99+
10th Energy Level
8,800.00 kJ/mol  
23
5,800.00 kJ/mol  
99+
11th Energy Level
8,800.00 kJ/mol  
20
8,300.00 kJ/mol  
24
12th Energy Level
8,800.00 kJ/mol  
40
8,300.00 kJ/mol  
99+
13th Energy Level
8,800.00 kJ/mol  
15
8,700.00 kJ/mol  
16
14th Energy Level
8,800.00 kJ/mol  
14
8,300.00 kJ/mol  
16
15th Energy Level
88,000.00 kJ/mol  
8
87,000.00 kJ/mol  
9
16th Energy Level
88,000.00 kJ/mol  
9
83,000.00 kJ/mol  
11
17th Energy Level
880.00 kJ/mol  
26
830.80 kJ/mol  
30
18th Energy Level
8,800.00 kJ/mol  
15
8,300.00 kJ/mol  
19
19th Energy Level
880.00 kJ/mol  
24
580.00 kJ/mol  
99+
20th Energy Level
880.00 kJ/mol  
14
580.00 kJ/mol  
99+
21st Energy Level
880.00 kJ/mol  
37
5,800.00 kJ/mol  
21
22nd Energy Level
880.00 kJ/mol  
12
580.00 kJ/mol  
99+
23rd Energy Level
8,800.00 kJ/mol  
7
5,800.00 kJ/mol  
21
24th Energy Level
880.00 kJ/mol  
8
538.70 kJ/mol  
99+
25th Energy Level
880.00 kJ/mol  
6
0.00 kJ/mol  
99+
26th Energy Level
880.00 kJ/mol  
6
580.00 kJ/mol  
99+
27th Energy Level
880.00 kJ/mol  
5
580.00 kJ/mol  
99+
28th Energy Level
880.00 kJ/mol  
8
880.00 kJ/mol  
8
29th Energy Level
880.00 kJ/mol  
9
580.00 kJ/mol  
99+
30th Energy Level
880.00 kJ/mol  
6
0.00 kJ/mol  
99+
Electrochemical Equivalent
1.14 g/amp-hr  
99+
3.10 g/amp-hr  
18
Electron Work Function
4.55 eV  
18
4.90 eV  
12
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
-  
Atomic
Atomic Number
77  
39
111  
7
Electron Configuration
[Xe] 4f14 5d7 6s2  
[Rn] 5f14 6d9 7s2  
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+
111  
7
Number of Neutrons
110  
28
161  
4
Number of Electrons
74  
99+
111  
7
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
200.00 pm  
7
Covalent Radius
141.00 pm  
99+
126.00 pm  
99+
Van der Waals Radius
202.00 pm  
34
280.00 pm  
6
Atomic Weight
192.22 amu  
34
281.00 amu  
6
Atomic Volume
9.53 cm3/mol  
99+
28.70 cm3/mol  
12
Adjacent Atomic Numbers
  
  
Previous Element
Osmium
  
Darmstadtium
  
Next Element
Platinum
  
Copernicium
  
Valence Electron Potential
140.00 (-eV)  
5
11.90 (-eV)  
99+
Lattice Constant
383.90 pm  
29
0.00 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.58  
35
1.90  
1
Mechanical
Density
  
  
Density At Room Temperature
22.56 g/cm3  
10
28.70 g/cm3  
6
Density When Liquid (at m.p.)
19.00 g/cm3  
13
28.70 g/cm3  
7
Tensile Strength
2,000.00 MPa  
2
65.00 MPa  
33
Viscosity
0.00  
21
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
26
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
210.00 GPa  
2
26.00 GPa  
36
Bulk Modulus
320.00 GPa  
3
0.00 GPa  
99+
Young's Modulus
528.00 GPa  
1
12.70 GPa  
99+
Poisson Ratio
0.26  
22
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
21.78  
12
28.70  
8
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
16
0.00 H/m  
12
Susceptibility
0.00  
5
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
47.10 nΩ·m  
99+
0.20 nΩ·m  
99+
Electrical Conductivity
0.19 106/cm Ω  
10
0.00 106/cm Ω  
99+
Electron Affinity
151.00 kJ/mol  
4
50.00 kJ/mol  
26
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.13 J/(kg K)  
40
Molar Heat Capacity
25.10 J/mol·K  
99+
23.70 J/mol·K  
99+
Thermal Conductivity
147.00 W/m·K  
10
0.10 W/m·K  
99+
Critical Temperature
2,719.00 K  
8
1,100.00 K  
99+
Thermal Expansion
6.40 µm/(m·K)  
99+
12.60 µm/(m·K)  
40
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol  
1
580.00 kJ/mol  
12
Enthalpy of Fusion
35.23 kJ/mol  
1
-  
Enthalpy of Atomization
837.00 kJ/mol  
1
580.00 kJ/mol  
14
Standard Molar Entropy
35.50 J/mol.K  
99+
57.00 J/mol.K  
30
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