Tantalum Polonium Comparison
Periodic Table
Symbol
Ta
Po
Group Number
5
13
16
2
Period Number
6
6
Block
d block
p block
Element Family
Transition Metal
Post-Transition
CAS Number
7440257
99+
7440086
99+
Space Group Name
Im_ 3m
Pm-3m
Space Group Number
229.00
1
221.00
3
Facts
Interesting Facts
- Tantalum metal is known as corrosion resistance.
- Tantalum metal can easily fabricated and It is a good conductor of heat and electricity.
- 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
Found in Minerals, Mining, Ores of Minerals
Mining, Ores of metals
History
Who Discovered
Anders Gustaf Ekeberg
Pierre Curie and Marie Curie
Discovery
In 1802
In 1898
Abundance
Abundance In Universe
8 * 10-9 %
31
Not Available
Abundance In Meteorites
0.00 %
99+
Not Available
Abundance In Earth's Crust
0.00 %
37
Not Available
Abundance In Oceans
0.00 %
31
0.00 %
99+
Uses
Uses & Benefits
- Tantalum metal is mainly used in the manufacturing of electron components. Its Oxide layer acts as an insulator.
- Tantalum metal is also used in surgical transplant like replacement of bone, skull plates and as a woven gauze.
- 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
Electrical Industry, Electronic Industry
Aerospace Industry, Ammunition Industry
Medical Uses
NA
NA
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Low Toxic
Highly Toxic
Present in Human Body
Yes
No
In Blood
Not Available
0.00 Blood/mg dm-3
37
In Bone
0.03 p.p.m.
28
0.00 p.p.m.
36
Physical Properties
Melting Point
2,996.00 °C
4
254.00 °C
99+
Boiling Point
5,425.00 °C
4
962.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Gray Blue
Silver
Luster
Metallic
NA
Hardness
Mohs Hardness
6.50
5
Not Available
Brinell Hardness
440.00 MPa
28
Not Available
Vickers Hardness
870.00 MPa
12
Not Available
Speed of Sound
3,400.00 m/s
22
Not Available
Optical Properties
Reflectivity
78.00 %
6
Not Available
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
Ta
Po
Isotopes
Known Isotopes
31
8
29
10
Electronegativity
Pauling Electronegativity
1.50
27
2.00
7
Allred Rochow Electronegativity
1.33
22
1.76
2
Mulliken-Jaffe Electronegativity
Not Available
2.48
1
Allen Electronegativity
1.34
33
2.19
2
Electropositivity
Pauling Electropositivity
2.50
27
2.00
99+
Ionization Energies
1st Energy Level
761.00 kJ/mol
18
812.10 kJ/mol
14
2nd Energy Level
1,500.00 kJ/mol
40
Not Available
Electrochemical Equivalent
1.35 g/amp-hr
99+
3.90 g/amp-hr
8
Electron Work Function
4.25 eV
21
Not Available
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
73
99+
84
32
Electron Configuration
[Xe] 4f14 5d3 6s2
[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
73
99+
84
32
Number of Neutrons
108
28
125
19
Number of Electrons
73
99+
84
32
Radius of an Atom
Atomic Radius
146.00 pm
35
168.00 pm
23
Covalent Radius
170.00 pm
25
140.00 pm
99+
Van der Waals Radius
200.00 pm
28
197.00 pm
29
Atomic Weight
180.95 amu
38
209.00 amu
28
Atomic Volume
10.90 cm3/mol
99+
22.23 cm3/mol
13
Adjacent Atomic Numbers
Valence Electron Potential
110.00 (-eV)
7
Not Available
Lattice Constant
330.13 pm
99+
335.90 pm
99+
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
16.69 g/cm3
18
9.20 g/cm3
99+
Density When Liquid (at m.p.)
15.00 g/cm3
9
9.40 g/cm3
19
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
0.00 (Pa)
31
Not Available
Elasticity properties
Shear Modulus
69.00 GPa
13
Not Available
Bulk Modulus
200.00 GPa
8
Not Available
Young's Modulus
186.00 GPa
13
Not Available
Poisson Ratio
0.34
10
Not Available
Other Mechanical Properties
Ductile
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
16.65
11
9.32
31
Magnetic Ordering
Paramagnetic
Nonmagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
131.00 nΩ·m
25
0.40 nΩ·m
99+
Electrical Conductivity
0.08 106/cm Ω
27
0.02 106/cm Ω
99+
Electron Affinity
31.00 kJ/mol
29
183.30 kJ/mol
3
Thermal Properties
Specific Heat
0.14 J/(kg K)
37
0.12 J/(kg K)
40
Molar Heat Capacity
25.36 J/mol·K
99+
26.40 J/mol·K
28
Thermal Conductivity
57.50 W/m·K
27
20.00 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
6.30 µm/(m·K)
99+
23.50 µm/(m·K)
16
Enthalpy
Enthalpy of Vaporization
753.10 kJ/mol
2
60.30 kJ/mol
99+
Enthalpy of Fusion
31.40 kJ/mol
3
13.00 kJ/mol
26
Enthalpy of Atomization
782.00 kJ/mol
3
134.00 kJ/mol
99+
Standard Molar Entropy
41.50 J/mol.K
37
Not Available
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