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Roentgenium vs Polonium

Roentgenium
Polonium
Polonium vs Roentgenium


Periodic Table
Symbol
Rg   
Po   
Group Number
11   
7
16   
2
Period Number
7   
6   
Block
d block   
p block   
Element Family
Unknown   
Post-​Transition   
CAS Number
54386242   
1
7440086   
99+
Space Group Name
Not Available   
Pm-3m   
Space Group Number
194.00   
5
221.00   
3
Facts
Interesting Facts
Not Available   
  • 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.
  
Sources
Synthetically Produced   
Mining, Ores of metals   
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung   
Pierre Curie and Marie Curie   
Discovery
In 1994   
In 1898   
Abundance
  
  
Abundance In Oceans
Not Available   
0.00 %   
99+
Uses
Uses & Benefits
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
  • 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.
  
Industrial Uses
NA   
Aerospace Industry, Ammunition Industry   
Medical Uses
NA   
NA   
Other Uses
Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Unknown   
Highly Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
37
In Bone
0.00 p.p.m.   
36
0.00 p.p.m.   
36
Physical Properties
Melting Point
Not Available   
254.00 °C   
99+
Boiling Point
Not Available   
962.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silver   
Luster
Unknown Luster   
NA   
Hardness
  
  
Speed of Sound
Not Available   
Not Available   
Optical Properties
  
  
Allotropes
No   
Yes   
α Allotropes
Not Available   
α-polonium   
β Allotropes
Not Available   
β-polonium   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Rg   
Po   
Isotopes
  
  
Known Isotopes
1   
34
29   
10
Electronegativity
  
  
Pauling Electronegativity
Not Available   
2.00   
7
Allred Rochow Electronegativity
Not Available   
1.76   
2
Mulliken-Jaffe Electronegativity
Not Available   
2.48   
1
Allen Electronegativity
Not Available   
2.19   
2
Electropositivity
  
  
Pauling Electropositivity
Not Available   
2.00   
99+
Ionization Energies
  
  
1st Energy Level
1,022.70 kJ/mol   
3
812.10 kJ/mol   
14
2nd Energy Level
2,074.40 kJ/mol   
10
Not Available   
3rd Energy Level
3,077.90 kJ/mol   
24
Not Available   
4th Energy Level
4,052.40 kJ/mol   
36
Not Available   
5th Energy Level
5,306.70 kJ/mol   
31
Not Available   
Electrochemical Equivalent
Not Available   
3.90 g/amp-hr   
8
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
NA   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
111   
7
84   
32
Electron Configuration
[Rn] 5f14 6d9 7s2   
[Xe] 4f14 5d10 6s2 6p4   
Crystal Structure
Body Centered Cubic (BCC)   
Monoclinic (MON)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
MON-Crystal-Structure-of-Polonium.jpg#100   
Atom
  
  
Number of Protons
111   
7
84   
32
Number of Neutrons
161   
3
125   
19
Number of Electrons
111   
7
84   
32
Radius of an Atom
  
  
Atomic Radius
Not Available   
168.00 pm   
23
Covalent Radius
Not Available   
140.00 pm   
99+
Van der Waals Radius
Not Available   
197.00 pm   
29
Atomic Weight
281.00 amu   
6
209.00 amu   
28
Atomic Volume
Not Available   
22.23 cm3/mol   
13
Adjacent Atomic Numbers
  
  
Previous Element
Darmstadtium
  
Bismuth
  
Next Element
Copernicium
  
Francium
  
Valence Electron Potential
Not Available   
Not Available   
Lattice Constant
Not Available   
335.90 pm   
99+
Lattice Angles
NA   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
28.70 g/cm3   
6
9.20 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
9.40 g/cm3   
19
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Unknown   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
9.32   
31
Magnetic Ordering
Unknown   
Nonmagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
Not Available   
0.40 nΩ·m   
99+
Electrical Conductivity
Not Available   
0.02 106/cm Ω   
99+
Electron Affinity
Not Available   
183.30 kJ/mol   
3
Thermal Properties
Specific Heat
Not Available   
0.12 J/(kg K)   
40
Molar Heat Capacity
Not Available   
26.40 J/mol·K   
28
Thermal Conductivity
Not Available   
20.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
23.50 µm/(m·K)   
16
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
60.30 kJ/mol   
99+
Enthalpy of Fusion
Not Available   
13.00 kJ/mol   
26
Enthalpy of Atomization
Not Available   
134.00 kJ/mol   
99+
Standard Molar Entropy
Not Available   
Not Available   
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