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Curium vs Francium

Curium
Francium
Francium vs Curium


Periodic Table
Symbol
Cm   
Fr   
Group Number
Not Available   
1   
17
Period Number
7   
7   
Block
f block   
s block   
Element Family
Actinide   
Alkali   
CAS Number
7440519   
36
7440735   
18
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.
  
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Sources
Bombarding Plutonium with Helium Ions   
Formed by Decay Process, Mining   
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso   
Marguerite Perey   
Discovery
In 1944   
In 1939   
Abundance
  
  
Uses
Uses & Benefits
  • Curium metal is used to provide power to electrical equipment for space missions.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Research Purposes   
NA   
Biological Properties
  
  
Toxicity
Unknown   
NA   
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
27.00 °C   
99+
Boiling Point
3,110.00 °C   
30
677.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
NA   
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   
Fr   
Isotopes
  
  
Known Isotopes
15   
24
33   
6
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
0.70   
99+
Allred Rochow Electronegativity
1.20   
27
0.86   
99+
Mulliken-Jaffe Electronegativity
Not Available   
0.68   
25
Allen Electronegativity
Not Available   
0.67   
99+
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
3.30   
1
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
380.00 kJ/mol   
99+
2nd Energy Level
1,196.00 kJ/mol   
99+
Not Available   
3rd Energy Level
2,026.00 kJ/mol   
99+
Not Available   
4th Energy Level
3,550.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
3.07 g/amp-hr   
16
8.32 g/amp-hr   
1
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
96   
22
87   
31
Electron Configuration
[Rn] 5f7 6d1 7s2   
[Rn] 7s1   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Body Centered Cubic (BCC)   
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
96   
22
87   
31
Number of Neutrons
151   
10
136   
17
Number of Electrons
96   
22
87   
31
Radius of an Atom
  
  
Atomic Radius
174.00 pm   
20
Not Available   
Covalent Radius
169.00 pm   
26
260.00 pm   
1
Van der Waals Radius
200.00 pm   
28
348.00 pm   
1
Atomic Weight
247.00 amu   
18
223.00 amu   
27
Atomic Volume
18.28 cm3/mol   
26
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Polonium
  
Next Element
Berkelium
  
Radium
  
Valence Electron Potential
44.50 (-eV)   
38
8.00 (-eV)   
99+
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
1.87 g/cm3   
99+
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   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Poor Conductor   
Resistivity
1.25 nΩ·m   
99+
3.00 nΩ·m   
99+
Electrical Conductivity
Not Available   
0.03 106/cm Ω   
40
Thermal Properties
Specific Heat
Not Available   
Not Available   
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
Not Available   
15.00 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
Not Available   
Enthalpy of Atomization
Not Available   
71.00 kJ/mol   
99+
Standard Molar Entropy
Not Available   
Not Available   
Periodic Table >>
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