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Polonium vs Roentgenium

Polonium
Roentgenium
Roentgenium vs Polonium


Periodic Table
Symbol
Po  
Rg  
Group Number
16  
2
11  
7
Period Number
6  
7  
Block
p block  
d block  
Element Family
Post-​Transition  
-  
CAS Number
7440086  
99+
54386242  
1
Space Group Name
Pm-3m  
-  
Space Group Number
221.00  
4
194.00  
7
Facts
Interesting Facts
  • Polonium was the first radioactive element to be discovered.
  • Polonium element and its compounds are highly radioactive.
  • Its alloy with Beryllium provides source of neutrons.
  
Roentgenium is a highly unstable synthetic element.  
Sources
Mining, Ores of metals  
Synthetically Produced  
History
  
  
Who Discovered
Pierre Curie and Marie Curie  
Gesellschaft für Schwerionenforschung  
Discovery
In 1898  
In 1994  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
40
Abundance In Sun
-  
-  
Abundance In Meteorites
-  
-  
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
-  
Uses
Uses & Benefits
  • Polonium metal has different Allotropes, it is used in antistatic devices and for research purpose.
  • A 1 gram of Polonium can reach a temperature of 500°C, hence it is used as a heat source for space equipment.
  
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Ammunition Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Research Purposes  
Biological Properties
  
  
Toxicity
Highly Toxic  
-  
Present in Human Body
No  
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
254.00 °C  
99+
-  
Boiling Point
962.00 °C  
99+
2,800.00 °C  
38
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silver  
Luster
-  
Unknown Luster  
Hardness
  
  
Mohs Hardness
2.50  
15
-  
Brinell Hardness
70.00 MPa  
99+
700.00 MPa  
17
Vickers Hardness
30.00 MPa  
99+
450.00 MPa  
38
Speed of Sound
2,260.00 m/s  
99+
3,430.00 m/s  
32
Optical Properties
  
  
Refractive Index
2.70  
3
1.30  
99+
Reflectivity
50.00 %  
31
64.00 %  
19
Allotropes
Yes  
No  
α Allotropes
α-polonium  
-  
β Allotropes
β-polonium  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Po  
Rg  
Isotopes
  
  
Known Isotopes
29  
10
1  
34
Electronegativity
  
  
Pauling Electronegativity
2.00  
8
0.00  
99+
Sanderson Electronegativity
2.00  
10
1.90  
13
Allred Rochow Electronegativity
1.76  
3
1.30  
25
Mulliken-Jaffe Electronegativity
2.48  
1
0.90  
99+
Allen Electronegativity
2.19  
2
0.80  
99+
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.20  
39
Ionization Energies
  
  
1st Energy Level
812.10 kJ/mol  
14
1,022.70 kJ/mol  
3
2nd Energy Level
1,833.20 kJ/mol  
17
2,074.40 kJ/mol  
10
3rd Energy Level
812.10 kJ/mol  
99+
3,077.90 kJ/mol  
24
4th Energy Level
8,121.00 kJ/mol  
7
4,052.40 kJ/mol  
99+
5th Energy Level
8,120.00 kJ/mol  
12
5,306.70 kJ/mol  
99+
6th Energy Level
8,120.00 kJ/mol  
32
11,100.00 kJ/mol  
10
7th Energy level
8,120.00 kJ/mol  
26
5,800.00 kJ/mol  
99+
8th Energy Level
8,120.00 kJ/mol  
26
5,800.00 kJ/mol  
99+
9th Energy Level
8,120.00 kJ/mol  
23
5,650.00 kJ/mol  
99+
10th Energy Level
8,120.00 kJ/mol  
27
5,800.00 kJ/mol  
99+
11th Energy Level
8,120.00 kJ/mol  
26
8,300.00 kJ/mol  
24
12th Energy Level
8,120.00 kJ/mol  
99+
8,300.00 kJ/mol  
99+
13th Energy Level
8,120.00 kJ/mol  
19
8,700.00 kJ/mol  
16
14th Energy Level
8,120.00 kJ/mol  
18
8,300.00 kJ/mol  
16
15th Energy Level
81,200.00 kJ/mol  
15
87,000.00 kJ/mol  
9
16th Energy Level
81,200.00 kJ/mol  
12
83,000.00 kJ/mol  
11
17th Energy Level
812.10 kJ/mol  
32
830.80 kJ/mol  
30
18th Energy Level
8,120.00 kJ/mol  
21
8,300.00 kJ/mol  
19
19th Energy Level
812.10 kJ/mol  
29
580.00 kJ/mol  
99+
20th Energy Level
812.00 kJ/mol  
22
580.00 kJ/mol  
99+
21st Energy Level
812.10 kJ/mol  
40
5,800.00 kJ/mol  
21
22nd Energy Level
812.00 kJ/mol  
17
580.00 kJ/mol  
99+
23rd Energy Level
812.10 kJ/mol  
99+
5,800.00 kJ/mol  
21
24th Energy Level
812.10 kJ/mol  
13
538.70 kJ/mol  
99+
25th Energy Level
812.10 kJ/mol  
11
0.00 kJ/mol  
99+
26th Energy Level
812.10 kJ/mol  
11
580.00 kJ/mol  
99+
27th Energy Level
812.10 kJ/mol  
10
580.00 kJ/mol  
99+
28th Energy Level
812.10 kJ/mol  
16
880.00 kJ/mol  
8
29th Energy Level
812.10 kJ/mol  
15
580.00 kJ/mol  
99+
30th Energy Level
812.00 kJ/mol  
11
0.00 kJ/mol  
99+
Electrochemical Equivalent
3.90 g/amp-hr  
8
3.10 g/amp-hr  
18
Electron Work Function
4.50 eV  
19
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
-  
Atomic
Atomic Number
84  
32
111  
7
Electron Configuration
[Xe] 4f14 5d10 6s2 6p4  
[Rn] 5f14 6d9 7s2  
Crystal Structure
Monoclinic (MON)  
Body Centered Cubic (BCC)  
Crystal Lattice
MON-Crystal-Structure-of-Polonium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
84  
32
111  
7
Number of Neutrons
125  
20
161  
4
Number of Electrons
84  
32
111  
7
Radius of an Atom
  
  
Atomic Radius
168.00 pm  
25
200.00 pm  
7
Covalent Radius
140.00 pm  
99+
126.00 pm  
99+
Van der Waals Radius
197.00 pm  
36
280.00 pm  
6
Atomic Weight
209.00 amu  
28
281.00 amu  
6
Atomic Volume
22.23 cm3/mol  
22
28.70 cm3/mol  
12
Adjacent Atomic Numbers
  
  
Previous Element
Bismuth
  
Darmstadtium
  
Next Element
Francium
  
Copernicium
  
Valence Electron Potential
9.30 (-eV)  
99+
11.90 (-eV)  
99+
Lattice Constant
335.90 pm  
99+
0.00 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.46  
99+
1.90  
1
Mechanical
Density
  
  
Density At Room Temperature
9.20 g/cm3  
99+
28.70 g/cm3  
6
Density When Liquid (at m.p.)
9.40 g/cm3  
99+
28.70 g/cm3  
7
Tensile Strength
50.00 MPa  
38
65.00 MPa  
33
Viscosity
0.00  
26
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)  
37
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
24.00 GPa  
40
26.00 GPa  
36
Bulk Modulus
46.00 GPa  
28
0.00 GPa  
99+
Young's Modulus
46.00 GPa  
99+
12.70 GPa  
99+
Poisson Ratio
0.23  
30
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.32  
99+
28.70  
8
Magnetic Ordering
Nonmagnetic  
-  
Permeability
0.00 H/m  
15
0.00 H/m  
12
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
0.40 nΩ·m  
99+
0.20 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
183.30 kJ/mol  
3
50.00 kJ/mol  
26
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.13 J/(kg K)  
40
Molar Heat Capacity
26.40 J/mol·K  
36
23.70 J/mol·K  
99+
Thermal Conductivity
20.00 W/m·K  
99+
0.10 W/m·K  
99+
Critical Temperature
527.00 K  
99+
1,100.00 K  
99+
Thermal Expansion
23.50 µm/(m·K)  
16
12.60 µm/(m·K)  
40
Enthalpy
  
  
Enthalpy of Vaporization
60.30 kJ/mol  
99+
580.00 kJ/mol  
12
Enthalpy of Fusion
13.00 kJ/mol  
32
-  
Enthalpy of Atomization
134.00 kJ/mol  
99+
580.00 kJ/mol  
14
Standard Molar Entropy
41.10 J/mol.K  
99+
57.00 J/mol.K  
30
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