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Curium Roentgenium Comparison

Curium
Roentgenium
Roentgenium Curium comparison


Periodic Table
Symbol
Cm   
Rg   
Group Number
Not Available   
11   
7
Period Number
7   
7   
Block
f block   
d block   
Element Family
Actinide   
Unknown   
CAS Number
7440519   
36
54386242   
1
Space Group Name
Not Available   
Not Available   
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.
  
Not Available   
Sources
Bombarding Plutonium with Helium Ions   
Synthetically Produced   
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso   
Gesellschaft für Schwerionenforschung   
Discovery
In 1944   
In 1994   
Abundance
  
  
Uses
Uses & Benefits
  • Curium metal is used to provide power to electrical equipment for space missions.
  
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Research Purposes   
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
1,340.00 °C   
34
Not Available   
Boiling Point
3,110.00 °C   
30
Not Available   
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silver   
Luster
Metallic   
Unknown Luster   
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   
Rg   
Isotopes
  
  
Known Isotopes
15   
24
1   
34
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
Not Available   
Allred Rochow Electronegativity
1.20   
27
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
Not Available   
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
1,022.70 kJ/mol   
3
2nd Energy Level
1,196.00 kJ/mol   
99+
2,074.40 kJ/mol   
10
3rd Energy Level
2,026.00 kJ/mol   
99+
3,077.90 kJ/mol   
24
4th Energy Level
3,550.00 kJ/mol   
99+
4,052.40 kJ/mol   
36
5th Energy Level
Not Available   
5,306.70 kJ/mol   
31
Electrochemical Equivalent
3.07 g/amp-hr   
16
Not Available   
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes   
NA   
Atomic Properties
Atomic Number
96   
22
111   
7
Electron Configuration
[Rn] 5f7 6d1 7s2   
[Rn] 5f14 6d9 7s2   
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
111   
7
Number of Neutrons
151   
10
161   
3
Number of Electrons
96   
22
111   
7
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
Not Available   
Atomic Weight
247.00 amu   
18
281.00 amu   
6
Atomic Volume
18.28 cm3/mol   
26
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Darmstadtium
  
Next Element
Berkelium
  
Copernicium
  
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
28.70 g/cm3   
6
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   
Unknown   
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   
Summary >>
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