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Curium vs Roentgenium


Roentgenium vs Curium


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
  

Next Element
Berkelium
  

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   

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