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Curium Americium Comparison

Curium
Americium
Americium Curium comparison


Periodic Table
Symbol
Cm   
Am   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7440519   
36
7440359   
99+
Space Group Name
Not Available   
P63/mmc   
Space Group Number
Not Available   
194.00   
5
Facts
Interesting Facts
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
  • Americium metal is produced by bombarding Plutonium with Neutrons.
  • Americium metal was discovered as a by-product while testing an atomic bomb (Manhattan Project).
  
Sources
Bombarding Plutonium with Helium Ions   
Obtained By Bombarding Plutonium with Neutrons   
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso   
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso   
Discovery
In 1944   
In 1944   
Abundance
  
  
Uses
Uses & Benefits
  • Curium metal is used to provide power to electrical equipment for space missions.
  
  • Americium metal is used in smoke detection alarms.
  • In the future, this metal has a potential to be used in batteries of spacecrafts.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Research Purposes   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Unknown   
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
1,340.00 °C   
34
994.00 °C   
99+
Boiling Point
3,110.00 °C   
30
2,607.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
Luster
Metallic   
NA   
Hardness
  
  
Speed of Sound
Not Available   
Not Available   
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
Cm   
Am   
Isotopes
  
  
Known Isotopes
15   
24
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.30   
32
Allred Rochow Electronegativity
1.20   
27
1.20   
27
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.70   
22
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
578.00 kJ/mol   
99+
2nd Energy Level
1,196.00 kJ/mol   
99+
1,158.00 kJ/mol   
99+
3rd Energy Level
2,026.00 kJ/mol   
99+
2,132.00 kJ/mol   
99+
4th Energy Level
3,550.00 kJ/mol   
99+
3,493.00 kJ/mol   
99+
Electrochemical Equivalent
3.07 g/amp-hr   
16
3.02 g/amp-hr   
17
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
96   
22
95   
23
Electron Configuration
[Rn] 5f7 6d1 7s2   
[Rn] 5f7 7s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100   
DHCP-Crystal-Structure-of-Americium.jpg#100   
Atom
  
  
Number of Protons
96   
22
95   
23
Number of Neutrons
151   
10
148   
12
Number of Electrons
96   
22
95   
23
Radius of an Atom
  
  
Atomic Radius
174.00 pm   
20
173.00 pm   
21
Covalent Radius
169.00 pm   
26
180.00 pm   
21
Van der Waals Radius
200.00 pm   
28
244.00 pm   
10
Atomic Weight
247.00 amu   
18
243.00 amu   
20
Atomic Volume
18.28 cm3/mol   
26
17.86 cm3/mol   
29
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Plutonium
  
Next Element
Berkelium
  
Curium
  
Valence Electron Potential
44.50 (-eV)   
38
44.00 (-eV)   
40
Lattice Constant
Not Available   
346.81 pm   
99+
Lattice Angles
NA   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
13.51 g/cm3   
25
12.00 g/cm3   
30
Density When Liquid (at m.p.)
13.85 g/cm3   
10
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
13
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Unknown   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.51   
17
13.67   
15
Magnetic Ordering
Antiferromagnetic   
Paramagnetic   
Electrical Properties
  
  
Resistivity
1.25 nΩ·m   
99+
0.69 nΩ·m   
99+
Electrical Conductivity
Not Available   
0.02 106/cm Ω   
99+
Thermal Properties
Specific Heat
Not Available   
0.11 J/(kg K)   
99+
Molar Heat Capacity
Not Available   
62.70 J/mol·K   
1
Thermal Conductivity
Not Available   
10.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Fusion
15.00 kJ/mol   
21
14.39 kJ/mol   
24
Enthalpy of Atomization
Not Available   
268.00 kJ/mol   
40
Standard Molar Entropy
Not Available   
Not Available   
Summary >>
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