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Technetium vs Polonium

Technetium
Polonium
Polonium vs Technetium


Periodic Table
Symbol
Tc   
Po   
Group Number
7   
11
16   
2
Period Number
5   
6   
Block
d block   
p block   
Element Family
Transition Metal   
Post-​Transition   
CAS Number
7440268   
99+
7440086   
99+
Space Group Name
P63/mmc   
Pm-3m   
Space Group Number
194.00   
5
221.00   
3
Facts
Interesting Facts
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
  • 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
Made by Bombarding Molybdenum with Deuterons   
Mining, Ores of metals   
History
  
  
Who Discovered
Emilio Segrè and Carlo Perriero   
Pierre Curie and Marie Curie   
Discovery
In 1937   
In 1898   
Abundance
  
  
Abundance In Oceans
Not Available   
0.00 %   
99+
Uses
Uses & Benefits
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
  • 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
Alloys, Nuclear Research, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Low Toxic   
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
2,200.00 °C   
9
254.00 °C   
99+
Boiling Point
4,877.00 °C   
7
962.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Shiny Gray   
Silver   
Luster
NA   
NA   
Hardness
  
  
Speed of Sound
16,200.00 m/s   
1
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
Tc   
Po   
Isotopes
  
  
Known Isotopes
18   
21
29   
10
Electronegativity
  
  
Pauling Electronegativity
1.90   
11
2.00   
7
Allred Rochow Electronegativity
1.36   
20
1.76   
2
Mulliken-Jaffe Electronegativity
Not Available   
2.48   
1
Allen Electronegativity
1.51   
28
2.19   
2
Electropositivity
  
  
Pauling Electropositivity
2.10   
99+
2.00   
99+
Ionization Energies
  
  
1st Energy Level
702.00 kJ/mol   
36
812.10 kJ/mol   
14
2nd Energy Level
1,470.00 kJ/mol   
99+
Not Available   
3rd Energy Level
2,850.00 kJ/mol   
33
Not Available   
Electrochemical Equivalent
0.52 g/amp-hr   
99+
3.90 g/amp-hr   
8
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
43   
99+
84   
32
Electron Configuration
[Kr] 4d5 5s2   
[Xe] 4f14 5d10 6s2 6p4   
Crystal Structure
Hexagonal Close Packed (HCP)   
Monoclinic (MON)   
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100   
MON-Crystal-Structure-of-Polonium.jpg#100   
Atom
  
  
Number of Protons
43   
99+
84   
32
Number of Neutrons
55   
99+
125   
19
Number of Electrons
43   
99+
84   
32
Radius of an Atom
  
  
Atomic Radius
136.00 pm   
99+
168.00 pm   
23
Covalent Radius
147.00 pm   
37
140.00 pm   
99+
Van der Waals Radius
200.00 pm   
28
197.00 pm   
29
Atomic Weight
98.00 amu   
99+
209.00 amu   
28
Atomic Volume
8.50 cm3/mol   
99+
22.23 cm3/mol   
13
Adjacent Atomic Numbers
  
  
Previous Element
Molybdenum
  
Bismuth
  
Next Element
Ruthenium
  
Francium
  
Valence Electron Potential
180.00 (-eV)   
3
Not Available   
Lattice Constant
273.50 pm   
99+
335.90 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
1.60   
5
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
11.00 g/cm3   
34
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
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
11.50   
24
9.32   
31
Magnetic Ordering
Paramagnetic   
Nonmagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
200.00 nΩ·m   
18
0.40 nΩ·m   
99+
Electrical Conductivity
0.07 106/cm Ω   
30
0.02 106/cm Ω   
99+
Electron Affinity
53.00 kJ/mol   
18
183.30 kJ/mol   
3
Thermal Properties
Specific Heat
0.21 J/(kg K)   
29
0.12 J/(kg K)   
40
Molar Heat Capacity
24.27 J/mol·K   
99+
26.40 J/mol·K   
28
Thermal Conductivity
50.60 W/m·K   
30
20.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
7.10 µm/(m·K)   
99+
23.50 µm/(m·K)   
16
Enthalpy
  
  
Enthalpy of Vaporization
660.00 kJ/mol   
6
60.30 kJ/mol   
99+
Enthalpy of Fusion
23.01 kJ/mol   
9
13.00 kJ/mol   
26
Enthalpy of Atomization
649.00 kJ/mol   
8
134.00 kJ/mol   
99+
Standard Molar Entropy
181.10 J/mol.K   
2
Not Available   
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