Technetium Barium Comparison
Periodic Table
Symbol
Tc
Ba
Group Number
7
11
2
16
Period Number
5
6
Block
d block
s block
Element Family
Transition Metal
Alkaline Earth
CAS Number
7440268
99+
7440393
99+
Space Group Name
P63/mmc
Im_ 3m
Space Group Number
194.00
5
229.00
1
Facts
Interesting Facts
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
- Barium oxidizes very easily in the air.
- All toxic compounds of Barium can easily dissolve in water.
- Barium carbonate is used to produce a Rat poison and its other compound Barium nitrate is used in fireworks to produce green color.
Sources
Made by Bombarding Molybdenum with Deuterons
Earth's crust, Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Emilio Segrè and Carlo Perriero
Carl Wilhelm Scheele
Discovery
In 1937
In 1772
Abundance
Abundance In Universe
Not Available
1 * 10-6 %
16
Abundance In Sun
~-9999 %
~0.000001 %
18
Abundance In Meteorites
Not Available
0.00 %
20
Abundance In Earth's Crust
Not Available
0.03 %
11
Abundance In Oceans
Not Available
0.00 %
8
Abundance In Humans
Not Available
0.00 %
12
Uses
Uses & Benefits
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
- It is sued in chemical paint manufacturing and glass manufacturing.
- Compounds of this metal are toxic; but still the barium sulfate is insoluble and given to patients suffering from digestive disorder.
Industrial Uses
NA
Ammunition Industry, Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
NA
Other Uses
Alloys, Nuclear Research, Research Purposes
Alloys
Biological Properties
Toxicity
Low Toxic
Low Toxic
Present in Human Body
No
Yes
In Blood
0.00 Blood/mg dm-3
37
0.07 Blood/mg dm-3
15
In Bone
0.00 p.p.m.
36
70.00 p.p.m.
9
Physical Properties
Melting Point
2,200.00 °C
9
725.00 °C
99+
Boiling Point
4,877.00 °C
7
1,140.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Shiny Gray
Silvery Gray
Luster
NA
NA
Hardness
Mohs Hardness
Not Available
1.25
19
Speed of Sound
16,200.00 m/s
1
1,620.00 m/s
99+
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Tc
Ba
Isotopes
Known Isotopes
18
21
37
2
Electronegativity
Pauling Electronegativity
1.90
11
0.89
99+
Sanderson Electronegativity
Not Available
0.68
28
Allred Rochow Electronegativity
1.36
20
0.97
38
Mulliken-Jaffe Electronegativity
Not Available
0.88
22
Allen Electronegativity
1.51
28
0.88
99+
Electropositivity
Pauling Electropositivity
2.10
99+
3.11
4
Ionization Energies
1st Energy Level
702.00 kJ/mol
36
502.90 kJ/mol
99+
2nd Energy Level
1,470.00 kJ/mol
99+
965.20 kJ/mol
99+
3rd Energy Level
2,850.00 kJ/mol
33
3,600.00 kJ/mol
14
Electrochemical Equivalent
0.52 g/amp-hr
99+
2.56 g/amp-hr
20
Electron Work Function
Not Available
2.70 eV
99+
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
43
99+
56
99+
Electron Configuration
[Kr] 4d5 5s2
[Xe] 6s2
Crystal Structure
Hexagonal Close Packed (HCP)
Body Centered Cubic (BCC)
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
43
99+
56
99+
Number of Neutrons
55
99+
81
99+
Number of Electrons
43
99+
56
99+
Radius of an Atom
Atomic Radius
136.00 pm
99+
222.00 pm
4
Covalent Radius
147.00 pm
37
215.00 pm
5
Van der Waals Radius
200.00 pm
28
268.00 pm
6
Atomic Weight
98.00 amu
99+
137.33 amu
99+
Atomic Volume
8.50 cm3/mol
99+
39.24 cm3/mol
5
Adjacent Atomic Numbers
Valence Electron Potential
180.00 (-eV)
3
21.30 (-eV)
99+
Lattice Constant
273.50 pm
99+
502.80 pm
15
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
3.51 g/cm3
99+
Density When Liquid (at m.p.)
Not Available
3.34 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
Not Available
7.11 (Pa)
6
Elasticity properties
Shear Modulus
Not Available
4.90 GPa
99+
Bulk Modulus
Not Available
9.60 GPa
99+
Young's Modulus
Not Available
13.00 GPa
99+
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
11.50
24
3.62
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Superconductor
Resistivity
200.00 nΩ·m
18
332.00 nΩ·m
13
Electrical Conductivity
0.07 106/cm Ω
30
0.03 106/cm Ω
40
Electron Affinity
53.00 kJ/mol
18
13.95 kJ/mol
36
Thermal Properties
Specific Heat
0.21 J/(kg K)
29
0.20 J/(kg K)
30
Molar Heat Capacity
24.27 J/mol·K
99+
28.07 J/mol·K
12
Thermal Conductivity
50.60 W/m·K
30
18.40 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
7.10 µm/(m·K)
99+
20.60 µm/(m·K)
22
Enthalpy
Enthalpy of Vaporization
660.00 kJ/mol
6
140.00 kJ/mol
99+
Enthalpy of Fusion
23.01 kJ/mol
9
7.66 kJ/mol
99+
Enthalpy of Atomization
649.00 kJ/mol
8
175.70 kJ/mol
99+
Standard Molar Entropy
181.10 J/mol.K
2
62.50 J/mol.K
20
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