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Polonium vs Technetium

Polonium
Technetium
Technetium vs Polonium


Periodic Table
Symbol
Po   
Tc   
Group Number
16   
2
7   
11
Period Number
6   
5   
Block
p block   
d block   
Element Family
Post-​Transition   
Transition Metal   
CAS Number
7440086   
99+
7440268   
99+
Space Group Name
Pm-3m   
P63/mmc   
Space Group Number
221.00   
3
194.00   
5
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.
  
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
Sources
Mining, Ores of metals   
Made by Bombarding Molybdenum with Deuterons   
History
  
  
Who Discovered
Pierre Curie and Marie Curie   
Emilio Segrè and Carlo Perriero   
Discovery
In 1898   
In 1937   
Abundance
  
  
Abundance In Oceans
0.00 %   
99+
Not Available   
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.
  
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
Industrial Uses
Aerospace Industry, Ammunition Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Highly Toxic   
Low 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
254.00 °C   
99+
2,200.00 °C   
9
Boiling Point
962.00 °C   
99+
4,877.00 °C   
7
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Shiny Gray   
Luster
NA   
NA   
Hardness
  
  
Speed of Sound
Not Available   
16,200.00 m/s   
1
Optical Properties
  
  
Allotropes
Yes   
No   
α Allotropes
α-polonium   
Not Available   
β Allotropes
β-polonium   
Not Available   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Po   
Tc   
Isotopes
  
  
Known Isotopes
29   
10
18   
21
Electronegativity
  
  
Pauling Electronegativity
2.00   
7
1.90   
11
Allred Rochow Electronegativity
1.76   
2
1.36   
20
Mulliken-Jaffe Electronegativity
2.48   
1
Not Available   
Allen Electronegativity
2.19   
2
1.51   
28
Electropositivity
  
  
Pauling Electropositivity
2.00   
99+
2.10   
99+
Ionization Energies
  
  
1st Energy Level
812.10 kJ/mol   
14
702.00 kJ/mol   
36
2nd Energy Level
Not Available   
1,470.00 kJ/mol   
99+
3rd Energy Level
Not Available   
2,850.00 kJ/mol   
33
Electrochemical Equivalent
3.90 g/amp-hr   
8
0.52 g/amp-hr   
99+
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
84   
32
43   
99+
Electron Configuration
[Xe] 4f14 5d10 6s2 6p4   
[Kr] 4d5 5s2   
Crystal Structure
Monoclinic (MON)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
MON-Crystal-Structure-of-Polonium.jpg#100   
HCP-Crystal-Structure-of-Technetium.jpg#100   
Atom
  
  
Number of Protons
84   
32
43   
99+
Number of Neutrons
125   
19
55   
99+
Number of Electrons
84   
32
43   
99+
Radius of an Atom
  
  
Atomic Radius
168.00 pm   
23
136.00 pm   
99+
Covalent Radius
140.00 pm   
99+
147.00 pm   
37
Van der Waals Radius
197.00 pm   
29
200.00 pm   
28
Atomic Weight
209.00 amu   
28
98.00 amu   
99+
Atomic Volume
22.23 cm3/mol   
13
8.50 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Bismuth
  
Molybdenum
  
Next Element
Francium
  
Ruthenium
  
Valence Electron Potential
Not Available   
180.00 (-eV)   
3
Lattice Constant
335.90 pm   
99+
273.50 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.60   
5
Mechanical Properties
Density
  
  
Density At Room Temperature
9.20 g/cm3   
99+
11.00 g/cm3   
34
Density When Liquid (at m.p.)
9.40 g/cm3   
19
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
9.32   
31
11.50   
24
Magnetic Ordering
Nonmagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
0.40 nΩ·m   
99+
200.00 nΩ·m   
18
Electrical Conductivity
0.02 106/cm Ω   
99+
0.07 106/cm Ω   
30
Electron Affinity
183.30 kJ/mol   
3
53.00 kJ/mol   
18
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.21 J/(kg K)   
29
Molar Heat Capacity
26.40 J/mol·K   
28
24.27 J/mol·K   
99+
Thermal Conductivity
20.00 W/m·K   
99+
50.60 W/m·K   
30
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
23.50 µm/(m·K)   
16
7.10 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
60.30 kJ/mol   
99+
660.00 kJ/mol   
6
Enthalpy of Fusion
13.00 kJ/mol   
26
23.01 kJ/mol   
9
Enthalpy of Atomization
134.00 kJ/mol   
99+
649.00 kJ/mol   
8
Standard Molar Entropy
Not Available   
181.10 J/mol.K   
2
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