Symbol
Cf
  
Bh
  
Group Number
Not Available
  
Period Number
7
  
7
  
Block
f block
  
d block
  
Element Family
Actinide
  
Transition Metal
  
Space Group Name
P63/mmc
  
Not Available
  
Space Group Number
Not Available
  
Interesting Facts
- Californium metal is very harmful and highly radioactive.
- Californium metal is the heaviest metal.
  
- Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
  
Sources
Made by Bombarding Curium with Helium Ions
  
Found in Minerals, Mining, Synthetically Produced
  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory
  
Gesellschaft für Schwerionenforschung
  
Discovery
In 1950
  
In 1981
  
Abundance
  
  
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 Bohrium 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
Melting Point
Not Available
  
Boiling Point
1,470.00 °C
  
99+
Not Available
  
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silver
  
Unknown
  
Luster
NA
  
Unknown Luster
  
Hardness
  
  
Mohs Hardness
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 Formula
Cf
  
Bh
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Not Available
  
Allred Rochow Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Not Available
  
Ionization Energies
  
  
1st Energy Level
608.00 kJ/mol
  
99+
742.90 kJ/mol
  
23
2nd Energy Level
1,206.00 kJ/mol
  
99+
1,688.50 kJ/mol
  
30
3rd Energy Level
2,267.00 kJ/mol
  
99+
2,566.50 kJ/mol
  
99+
4th Energy Level
3,599.00 kJ/mol
  
99+
3,598.90 kJ/mol
  
99+
5th Energy Level
Not Available
  
4,727.80 kJ/mol
  
37
6th Energy Level
Not Available
  
5,991.70 kJ/mol
  
24
7th Energy level
Not Available
  
7,226.80 kJ/mol
  
22
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
  
Ionization, Radioactive Isotopes
  
Electron Configuration
[Rn] 5f10 7s2
  
[Rn] 5f14 6d5 7s2
  
Crystal Structure
Double Hexagonal Close Packed (DHCP)
  
Hexagonal Close Packed (HCP)
  
Crystal Lattice
DHCP-Crystal-Structure-of-Californium.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Covalent Radius
Not Available
  
Atomic Volume
Not Available
  
Not Available
  
Adjacent Atomic Numbers
  
  
Valence Electron Potential
44.50 (-eV)
  
38
Not Available
  
Lattice Constant
Not Available
  
Lattice Angles
π/2, π/2, 2 π/3
  
NA
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Density
  
  
Density At Room Temperature
15.10 g/cm3
  
21
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 Characteristics
  
  
Specific Gravity
Not Available
  
Magnetic Ordering
Paramagnetic
  
Unknown
  
Electrical 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