Polonium Technetium Comparison
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
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
|
||
|
||
|
