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Fermium vs Curium

Fermium
Curium
Curium vs Fermium


Periodic Table
Symbol
Fm   
Cm   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7440724   
19
7440519   
36
Space Group Name
Not Available   
Not Available   
Space Group Number
Not Available   
Not Available   
Facts
Interesting Facts
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
Sources
Bombarding Pu-239 with Neutrons   
Bombarding Plutonium with Helium Ions   
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory   
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso   
Discovery
In 1952   
In 1944   
Abundance
  
  
Uses
Uses & Benefits
  • Currently known uses of Fermium metal are limited to research purpose only.
  
  • Curium metal is used to provide power to electrical equipment for space missions.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
NA   
Research Purposes   
Biological Properties
  
  
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
1,527.00 °C   
26
1,340.00 °C   
34
Boiling Point
Not Available   
3,110.00 °C   
30
Appearance
  
  
Physical State
Solid   
Solid   
Color
Unknown   
Silver   
Luster
Not Defined   
Metallic   
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
Fm   
Cm   
Isotopes
  
  
Known Isotopes
18   
21
15   
24
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
627.00 kJ/mol   
99+
581.00 kJ/mol   
99+
2nd Energy Level
1,225.00 kJ/mol   
99+
1,196.00 kJ/mol   
99+
3rd Energy Level
2,363.00 kJ/mol   
99+
2,026.00 kJ/mol   
99+
4th Energy Level
3,792.00 kJ/mol   
99+
3,550.00 kJ/mol   
99+
Electrochemical Equivalent
3.20 g/amp-hr   
13
3.07 g/amp-hr   
16
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
100   
18
96   
22
Electron Configuration
[Rn] 5f12 7s2   
[Rn] 5f7 6d1 7s2   
Crystal Structure
Not Known   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100   
DHCP-Crystal-Structure-of-Curium.jpg#100   
Atom
  
  
Number of Protons
100   
18
96   
22
Number of Neutrons
157   
7
151   
10
Number of Electrons
100   
18
96   
22
Radius of an Atom
  
  
Atomic Radius
Not Available   
174.00 pm   
20
Covalent Radius
Not Available   
169.00 pm   
26
Van der Waals Radius
245.00 pm   
9
200.00 pm   
28
Atomic Weight
257.00 amu   
15
247.00 amu   
18
Atomic Volume
Not Available   
18.28 cm3/mol   
26
Adjacent Atomic Numbers
  
  
Previous Element
Einsteinium
  
Americium
  
Next Element
Mendelevium
  
Berkelium
  
Valence Electron Potential
Not Available   
44.50 (-eV)   
38
Lattice Constant
Not Available   
Not Available   
Lattice Angles
NA   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
Not Available   
13.51 g/cm3   
25
Density When Liquid (at m.p.)
Not Available   
13.85 g/cm3   
10
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
NA   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
13.51   
17
Magnetic Ordering
Unknown   
Antiferromagnetic   
Electrical Properties
  
  
Resistivity
Not Available   
1.25 nΩ·m   
99+
Thermal Properties
Specific Heat
Not Available   
Not Available   
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
Not Available   
Not Available   
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Fusion
Not Available   
15.00 kJ/mol   
21
Standard Molar Entropy
Not Available   
Not Available   
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