Gold Technetium Comparison
Periodic Table
Symbol
Au
Tc
Group Number
11
7
7
11
Period Number
6
5
Block
d block
d block
Element Family
Transition Metal
Transition Metal
CAS Number
7440575
31
7440268
99+
Space Group Name
Fm_ 3m
P63/mmc
Space Group Number
225.00
2
194.00
5
Facts
Interesting Facts
- It is found in copper ores and from the crust of the earth.
- It is the most malleable and ductile metal.
- Gold alloys are used in Dentistry as fillings, crowning, clips, etc. It is also used as an artificial limb joints.
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
Sources
Earth's crust, Mining, Ores of metals
Made by Bombarding Molybdenum with Deuterons
History
Who Discovered
Unknown
Emilio Segrè and Carlo Perriero
Discovery
Before 6000 BCE
In 1937
Abundance
Abundance In Universe
6 * 10-8 %
26
Not Available
Abundance In Sun
~0.0000001 %
26
~-9999 %
Abundance In Meteorites
0.00 %
99+
Not Available
Abundance In Earth's Crust
0.00 %
99+
Not Available
Abundance In Oceans
0.00 %
21
Not Available
Abundance In Humans
0.00 %
18
Not Available
Uses
Uses & Benefits
- Gold metal is mainly used for Jewelry, bullion, coinage, etc.
- It is used in the art, decoration, ornaments, etc. It is also used for electroplating process.
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
Industrial Uses
Chemical Industry, Clothing Industry, Electrical Industry, Electronic Industry
NA
Medical Uses
Dentistry, Pharmaceutical Industry
NA
Other Uses
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Non Toxic
Low Toxic
Present in Human Body
Yes
No
In Blood
0.00 Blood/mg dm-3
35
0.00 Blood/mg dm-3
37
In Bone
0.02 p.p.m.
30
0.00 p.p.m.
36
Physical Properties
Melting Point
1,064.43 °C
99+
2,200.00 °C
9
Boiling Point
2,807.00 °C
36
4,877.00 °C
7
Appearance
Physical State
Solid
Solid
Color
Gold
Shiny Gray
Luster
Metallic
NA
Hardness
Mohs Hardness
2.50
14
Not Available
Brinell Hardness
194.00 MPa
99+
Not Available
Vickers Hardness
216.00 MPa
31
Not Available
Speed of Sound
2,030.00 m/s
99+
16,200.00 m/s
1
Optical Properties
Reflectivity
95.00 %
2
Not Available
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
Au
Tc
Isotopes
Known Isotopes
36
3
18
21
Electronegativity
Pauling Electronegativity
2.54
1
1.90
11
Allred Rochow Electronegativity
1.42
18
1.36
20
Mulliken-Jaffe Electronegativity
1.87
7
Not Available
Allen Electronegativity
1.92
5
1.51
28
Electropositivity
Pauling Electropositivity
1.46
99+
2.10
99+
Ionization Energies
1st Energy Level
890.10 kJ/mol
8
702.00 kJ/mol
36
2nd Energy Level
1,980.00 kJ/mol
12
1,470.00 kJ/mol
99+
3rd Energy Level
Not Available
2,850.00 kJ/mol
33
Electrochemical Equivalent
2.45 g/amp-hr
21
0.52 g/amp-hr
99+
Electron Work Function
5.10 eV
4
Not Available
Other Chemical Properties
Chemical Stability, Ionization, Solubility
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
79
37
43
99+
Electron Configuration
[Xe] 4f14 5d10 6s1
[Kr] 4d5 5s2
Crystal Structure
Face Centered Cubic (FCC)
Hexagonal Close Packed (HCP)
Crystal Lattice
FCC-Crystal-Structure-of-Gold.jpg#100
HCP-Crystal-Structure-of-Technetium.jpg#100
Atom
Number of Protons
79
37
43
99+
Number of Neutrons
118
23
55
99+
Number of Electrons
79
37
43
99+
Radius of an Atom
Atomic Radius
151.00 pm
32
136.00 pm
99+
Covalent Radius
144.00 pm
40
147.00 pm
37
Van der Waals Radius
166.00 pm
39
200.00 pm
28
Atomic Weight
196.97 amu
33
98.00 amu
99+
Atomic Volume
10.20 cm3/mol
99+
8.50 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
43.40 (-eV)
99+
180.00 (-eV)
3
Lattice Constant
407.82 pm
21
273.50 pm
99+
Lattice Angles
π/2, π/2, π/2
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.61
4
1.60
5
Mechanical Properties
Density
Density At Room Temperature
19.30 g/cm3
15
11.00 g/cm3
34
Density When Liquid (at m.p.)
17.31 g/cm3
6
Not Available
Tensile Strength
120.00 MPa
15
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
23
Not Available
Vapor Pressure at 2000 K
67.00 (Pa)
4
Not Available
Elasticity properties
Shear Modulus
27.00 GPa
27
Not Available
Bulk Modulus
180.00 GPa
9
Not Available
Young's Modulus
79.00 GPa
24
Not Available
Poisson Ratio
0.40
4
Not Available
Other Mechanical Properties
Ductile, Malleable
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
19.32
8
11.50
24
Magnetic Ordering
Diamagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
2.20 nΩ·m
99+
200.00 nΩ·m
18
Electrical Conductivity
0.45 106/cm Ω
3
0.07 106/cm Ω
30
Electron Affinity
222.80 kJ/mol
1
53.00 kJ/mol
18
Thermal Properties
Specific Heat
0.13 J/(kg K)
39
0.21 J/(kg K)
29
Molar Heat Capacity
25.42 J/mol·K
40
24.27 J/mol·K
99+
Thermal Conductivity
318.00 W/m·K
3
50.60 W/m·K
30
Critical Temperature
Not Available
Not Available
Thermal Expansion
14.20 µm/(m·K)
26
7.10 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
324.40 kJ/mol
27
660.00 kJ/mol
6
Enthalpy of Fusion
12.55 kJ/mol
27
23.01 kJ/mol
9
Enthalpy of Atomization
364.00 kJ/mol
25
649.00 kJ/mol
8
Standard Molar Entropy
47.40 J/mol.K
32
181.10 J/mol.K
2
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