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Californium Roentgenium Comparison


Roentgenium Californium comparison


Periodic Table

Symbol
Cf   
Rg   

Group Number
Not Available   
11   
7

Period Number
7   
7   

Block
f block   
d block   

Element Family
Actinide   
Unknown   

CAS Number
7440713   
20
54386242   
1

Space Group Name
P63/mmc   
Not Available   

Space Group Number
194.00   
5
194.00   
5

Facts

Interesting Facts
  • Californium metal is very harmful and highly radioactive.
  • Californium metal is the heaviest metal.
  
Not Available   

Sources
Made by Bombarding Curium with Helium Ions   
Synthetically Produced   

History
  
  

Who Discovered
Lawrence Berkeley National Laboratory   
Gesellschaft für Schwerionenforschung   

Discovery
In 1950   
In 1994   

Abundance
  
  

Uses

Uses & Benefits
  • Californium metal has a very strong neutron emitter. It is used as a metal detector.
  • It also used as an identifier to check Water and oil layers in oil wells.
  
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  

Industrial Uses
Chemical Industry   
NA   

Medical Uses
NA   
NA   

Other Uses
Alloys, Nuclear Research   
Research Purposes   

Biological Properties
  
  

Toxicity
Toxic   
Unknown   

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
900.00 °C   
99+
Not Available   

Boiling Point
1,470.00 °C   
99+
Not Available   

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silver   
Silver   

Luster
NA   
Unknown Luster   

Hardness
  
  

Mohs Hardness
3.00   
12
Not Available   

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
Cf   
Rg   

Isotopes
  
  

Known Isotopes
20   
19
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
608.00 kJ/mol   
99+
1,022.70 kJ/mol   
3

2nd Energy Level
1,206.00 kJ/mol   
99+
2,074.40 kJ/mol   
10

3rd Energy Level
2,267.00 kJ/mol   
99+
3,077.90 kJ/mol   
24

4th Energy Level
3,599.00 kJ/mol   
99+
4,052.40 kJ/mol   
36

5th Energy Level
Not Available   
5,306.70 kJ/mol   
31

Electrochemical Equivalent
3.12 g/amp-hr   
15
Not Available   

Electron Work Function
Not Available   
Not Available   

Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
NA   

Atomic Properties

Atomic Number
98   
20
111   
7

Electron Configuration
[Rn] 5f10 7s2   
[Rn] 5f14 6d9 7s2   

Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Body Centered Cubic (BCC)   

Crystal Lattice
DHCP-Crystal-Structure-of-Californium.jpg#100   
BCC-Crystal-Structure-.jpg#100   

Atom
  
  

Number of Protons
98   
20
111   
7

Number of Neutrons
153   
9
161   
3

Number of Electrons
98   
20
111   
7

Radius of an Atom
  
  

Atomic Radius
186.00 pm   
9
Not Available   

Atomic Weight
251.00 amu   
17
281.00 amu   
6

Atomic Volume
Not Available   
Not Available   

Adjacent Atomic Numbers
  
  

Previous Element
Berkelium
  

Next Element

Valence Electron Potential
44.50 (-eV)   
38
Not Available   

Lattice Constant
338.00 pm   
99+
Not Available   

Lattice Angles
π/2, π/2, 2 π/3   
NA   

Lattice C/A Ratio
Not Available   
Not Available   

Mechanical Properties

Density
  
  

Density At Room Temperature
15.10 g/cm3   
21
28.70 g/cm3   
6

Tensile Strength
Not Available   
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Elasticity properties
  
  

Poisson Ratio
Not Available   
Not Available   

Other Mechanical Properties
Malleable, Sectile   
Unknown   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
15.10   
13
Not Available   

Magnetic Ordering
Paramagnetic   
Unknown   

Electrical Properties
  
  

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
  
  

Standard Molar Entropy
Not Available   
Not Available   

Summary >>
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