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Americium vs Technetium

Americium
Technetium
Technetium vs Americium


Periodic Table
Symbol
Am   
Tc   
Group Number
Not Available   
7   
11
Period Number
7   
5   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440359   
99+
7440268   
99+
Space Group Name
P63/mmc   
P63/mmc   
Space Group Number
194.00   
5
194.00   
5
Facts
Interesting Facts
  • Americium metal is produced by bombarding Plutonium with Neutrons.
  • Americium metal was discovered as a by-product while testing an atomic bomb (Manhattan Project).
  
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
Sources
Obtained By Bombarding Plutonium with Neutrons   
Made by Bombarding Molybdenum with Deuterons   
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso   
Emilio Segrè and Carlo Perriero   
Discovery
In 1944   
In 1937   
Abundance
  
  
Uses
Uses & Benefits
  • Americium metal is used in smoke detection alarms.
  • In the future, this metal has a potential to be used in batteries of spacecrafts.
  
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
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
994.00 °C   
99+
2,200.00 °C   
9
Boiling Point
2,607.00 °C   
99+
4,877.00 °C   
7
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Shiny Gray   
Luster
NA   
NA   
Hardness
  
  
Speed of Sound
Not Available   
16,200.00 m/s   
1
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
Am   
Tc   
Isotopes
  
  
Known Isotopes
16   
23
18   
21
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.90   
11
Allred Rochow Electronegativity
1.20   
27
1.36   
20
Allen Electronegativity
Not Available   
1.51   
28
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.10   
99+
Ionization Energies
  
  
1st Energy Level
578.00 kJ/mol   
99+
702.00 kJ/mol   
36
2nd Energy Level
1,158.00 kJ/mol   
99+
1,470.00 kJ/mol   
99+
3rd Energy Level
2,132.00 kJ/mol   
99+
2,850.00 kJ/mol   
33
4th Energy Level
3,493.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
3.02 g/amp-hr   
17
0.52 g/amp-hr   
99+
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
95   
23
43   
99+
Electron Configuration
[Rn] 5f7 7s2   
[Kr] 4d5 5s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100   
HCP-Crystal-Structure-of-Technetium.jpg#100   
Atom
  
  
Number of Protons
95   
23
43   
99+
Number of Neutrons
148   
12
55   
99+
Number of Electrons
95   
23
43   
99+
Radius of an Atom
  
  
Atomic Radius
173.00 pm   
21
136.00 pm   
99+
Covalent Radius
180.00 pm   
21
147.00 pm   
37
Van der Waals Radius
244.00 pm   
10
200.00 pm   
28
Atomic Weight
243.00 amu   
20
98.00 amu   
99+
Atomic Volume
17.86 cm3/mol   
29
8.50 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Plutonium
  
Molybdenum
  
Next Element
Curium
  
Ruthenium
  
Valence Electron Potential
44.00 (-eV)   
40
180.00 (-eV)   
3
Lattice Constant
346.81 pm   
99+
273.50 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.60   
5
Mechanical Properties
Density
  
  
Density At Room Temperature
12.00 g/cm3   
30
11.00 g/cm3   
34
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
13
Not Available   
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.67   
15
11.50   
24
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
0.69 nΩ·m   
99+
200.00 nΩ·m   
18
Electrical Conductivity
0.02 106/cm Ω   
99+
0.07 106/cm Ω   
30
Electron Affinity
Not Available   
53.00 kJ/mol   
18
Thermal Properties
Specific Heat
0.11 J/(kg K)   
99+
0.21 J/(kg K)   
29
Molar Heat Capacity
62.70 J/mol·K   
1
24.27 J/mol·K   
99+
Thermal Conductivity
10.00 W/m·K   
99+
50.60 W/m·K   
30
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
7.10 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
660.00 kJ/mol   
6
Enthalpy of Fusion
14.39 kJ/mol   
24
23.01 kJ/mol   
9
Enthalpy of Atomization
268.00 kJ/mol   
40
649.00 kJ/mol   
8
Standard Molar Entropy
Not Available   
181.10 J/mol.K   
2
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