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Curium vs Fermium

Curium
Fermium
Fermium vs Curium


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