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Roentgenium vs Lead

Roentgenium
Lead
Lead vs Roentgenium


Periodic Table
Symbol
Rg  
Pb  
Group Number
11  
7
14  
4
Period Number
7  
6  
Block
d block  
p block  
Element Family
-  
Post-​Transition  
CAS Number
54386242  
1
7439921  
99+
Space Group Name
-  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
Roentgenium is a highly unstable synthetic element.  
  • Galena mineral contains almost 87% of Lead metal in it, Galena is sulfide mineral.
  • The best available source of Lead metal today is by recycling automobile batteries.
  
Sources
Synthetically Produced  
Earth's crust, Found in Minerals, Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung  
-  
Discovery
In 1994  
In Middle Easterns (7000 BCE)  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
17
Abundance In Sun
-  
0.00 %  
18
Abundance In Meteorites
-  
0.00 %  
23
Abundance In Earth's Crust
-  
0.00 %  
26
Abundance In Oceans
-  
0.00 %  
22
Abundance In Humans
-  
0.00 %  
9
Uses
Uses & Benefits
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
  • It is also used in insecticides, hair dyes and as an anti-knocking additive for petrol. But all these are banned by the government as Lead metal is known for detrimental to health.
  
Industrial Uses
-  
Chemical Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
Surgical Instruments Manufacturing  
Other Uses
Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
-  
Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.21 Blood/mg dm-3  
11
In Bone
0.00 p.p.m.  
99+
30.00 p.p.m.  
10
Physical
Melting Point
-  
327.50 °C  
99+
Boiling Point
2,800.00 °C  
38
1,740.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Gray  
Luster
Unknown Luster  
Metallic  
Hardness
  
  
Mohs Hardness
-  
1.50  
19
Brinell Hardness
700.00 MPa  
17
38.00 MPa  
99+
Vickers Hardness
450.00 MPa  
38
38.00 MPa  
99+
Speed of Sound
3,430.00 m/s  
32
1,190.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
2.02  
14
Reflectivity
64.00 %  
19
5.00 %  
39
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rg  
Pb  
Isotopes
  
  
Known Isotopes
1  
34
35  
4
Electronegativity
  
  
Pauling Electronegativity
0.00  
99+
1.87  
14
Sanderson Electronegativity
1.90  
13
2.29  
4
Allred Rochow Electronegativity
1.30  
25
1.55  
12
Mulliken-Jaffe Electronegativity
0.90  
99+
2.41  
2
Allen Electronegativity
0.80  
99+
1.85  
11
Electropositivity
  
  
Pauling Electropositivity
2.20  
39
1.67  
99+
Ionization Energies
  
  
1st Energy Level
1,022.70 kJ/mol  
3
715.60 kJ/mol  
31
2nd Energy Level
2,074.40 kJ/mol  
10
1,450.50 kJ/mol  
99+
3rd Energy Level
3,077.90 kJ/mol  
24
3,081.50 kJ/mol  
23
4th Energy Level
4,052.40 kJ/mol  
99+
4,083.00 kJ/mol  
99+
5th Energy Level
5,306.70 kJ/mol  
99+
6,640.00 kJ/mol  
32
6th Energy Level
11,100.00 kJ/mol  
10
7,150.00 kJ/mol  
99+
7th Energy level
5,800.00 kJ/mol  
99+
7,156.00 kJ/mol  
36
8th Energy Level
5,800.00 kJ/mol  
99+
7,150.00 kJ/mol  
32
9th Energy Level
5,650.00 kJ/mol  
99+
7,156.00 kJ/mol  
30
10th Energy Level
5,800.00 kJ/mol  
99+
7,156.00 kJ/mol  
34
11th Energy Level
8,300.00 kJ/mol  
24
7,156.00 kJ/mol  
33
12th Energy Level
8,300.00 kJ/mol  
99+
7,150.00 kJ/mol  
99+
13th Energy Level
8,700.00 kJ/mol  
16
7,150.00 kJ/mol  
28
14th Energy Level
8,300.00 kJ/mol  
16
715.60 kJ/mol  
99+
15th Energy Level
87,000.00 kJ/mol  
9
71,500.00 kJ/mol  
24
16th Energy Level
83,000.00 kJ/mol  
11
71,500.00 kJ/mol  
19
17th Energy Level
830.80 kJ/mol  
30
715.60 kJ/mol  
40
18th Energy Level
8,300.00 kJ/mol  
19
7,150.00 kJ/mol  
30
19th Energy Level
580.00 kJ/mol  
99+
715.60 kJ/mol  
37
20th Energy Level
580.00 kJ/mol  
99+
715.00 kJ/mol  
31
21st Energy Level
5,800.00 kJ/mol  
21
715.60 kJ/mol  
99+
22nd Energy Level
580.00 kJ/mol  
99+
715.00 kJ/mol  
25
23rd Energy Level
5,800.00 kJ/mol  
21
715.60 kJ/mol  
99+
24th Energy Level
538.70 kJ/mol  
99+
715.60 kJ/mol  
24
25th Energy Level
0.00 kJ/mol  
99+
715.00 kJ/mol  
25
26th Energy Level
580.00 kJ/mol  
99+
715.60 kJ/mol  
24
27th Energy Level
580.00 kJ/mol  
99+
715.60 kJ/mol  
23
28th Energy Level
880.00 kJ/mol  
8
715.60 kJ/mol  
29
29th Energy Level
580.00 kJ/mol  
99+
715.60 kJ/mol  
30
30th Energy Level
0.00 kJ/mol  
99+
715.00 kJ/mol  
24
Electrochemical Equivalent
3.10 g/amp-hr  
18
3.87 g/amp-hr  
9
Electron Work Function
4.90 eV  
12
4.25 eV  
28
Other Chemical Properties
-  
Anti Corrosion, Ionization, Radioactive Isotopes  
Atomic
Atomic Number
111  
7
82  
34
Electron Configuration
[Rn] 5f14 6d9 7s2  
[Xe] 4f14 5d10 6s2 6p2  
Crystal Structure
Body Centered Cubic (BCC)  
Face Centered Cubic (FCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
FCC-Crystal-Structure-of-Lead.jpg#100  
Atom
  
  
Number of Protons
111  
7
82  
34
Number of Neutrons
161  
4
125  
20
Number of Electrons
111  
7
82  
34
Radius of an Atom
  
  
Atomic Radius
200.00 pm  
7
175.00 pm  
21
Covalent Radius
126.00 pm  
99+
146.00 pm  
40
Van der Waals Radius
280.00 pm  
6
202.00 pm  
34
Atomic Weight
281.00 amu  
6
207.20 amu  
30
Atomic Volume
28.70 cm3/mol  
12
18.17 cm3/mol  
39
Adjacent Atomic Numbers
  
  
Previous Element
Darmstadtium
  
Thallium
  
Next Element
Copernicium
  
Bismuth
  
Valence Electron Potential
11.90 (-eV)  
99+
24.20 (-eV)  
99+
Lattice Constant
0.00 pm  
99+
495.08 pm  
18
Lattice Angles
-  
π/2, π/2, π/2  
Lattice C/A Ratio
1.90  
1
1.51  
99+
Mechanical
Density
  
  
Density At Room Temperature
28.70 g/cm3  
6
11.34 g/cm3  
35
Density When Liquid (at m.p.)
28.70 g/cm3  
7
10.66 g/cm3  
36
Tensile Strength
65.00 MPa  
33
12.00 MPa  
99+
Viscosity
0.00  
25
0.00  
29
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
1.64 (Pa)  
7
Vapor Pressure at 2000 K
0.00 (Pa)  
99+
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
26.00 GPa  
36
5.60 GPa  
99+
Bulk Modulus
0.00 GPa  
99+
46.00 GPa  
28
Young's Modulus
12.70 GPa  
99+
16.00 GPa  
99+
Poisson Ratio
0.30  
14
0.44  
3
Other Mechanical Properties
-  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
28.70  
8
11.35  
38
Magnetic Ordering
-  
Diamagnetic  
Permeability
0.00 H/m  
12
0.00 H/m  
12
Susceptibility
0.00  
24
0.00  
30
Electrical Properties
  
  
Electrical Property
-  
Poor Conductor  
Resistivity
0.20 nΩ·m  
99+
208.00 nΩ·m  
16
Electrical Conductivity
0.00 106/cm Ω  
99+
0.05 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
35.10 kJ/mol  
33
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.13 J/(kg K)  
40
Molar Heat Capacity
23.70 J/mol·K  
99+
26.65 J/mol·K  
34
Thermal Conductivity
0.10 W/m·K  
99+
35.30 W/m·K  
39
Critical Temperature
1,100.00 K  
99+
600.61 K  
99+
Thermal Expansion
12.60 µm/(m·K)  
40
28.90 µm/(m·K)  
13
Enthalpy
  
  
Enthalpy of Vaporization
580.00 kJ/mol  
12
179.40 kJ/mol  
99+
Enthalpy of Fusion
-  
4.77 kJ/mol  
99+
Enthalpy of Atomization
580.00 kJ/mol  
14
194.60 kJ/mol  
99+
Standard Molar Entropy
57.00 J/mol.K  
30
64.80 J/mol.K  
18
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