Home

Transition Metals + -

Actinide Metals + -

Lanthanide Metals + -

Post-Transition Metals + -

Alkaline Earth Metals + -

Compare Metals

Neptunium vs Californium

Neptunium
Californium
Californium vs Neptunium


Periodic Table
Symbol
Np   
Cf   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7439998   
99+
7440713   
20
Space Group Name
Pnma   
P63/mmc   
Space Group Number
62.00   
11
194.00   
5
Facts
Interesting Facts
Not Available   
  • Californium metal is very harmful and highly radioactive.
  • Californium metal is the heaviest metal.
  
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals   
Made by Bombarding Curium with Helium Ions   
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson   
Lawrence Berkeley National Laboratory   
Discovery
In 1940   
In 1950   
Abundance
  
  
Uses
Uses & Benefits
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
  • 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.
  
Industrial Uses
NA   
Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys, Nuclear Research   
Biological Properties
  
  
Toxicity
Toxic   
Toxic   
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
640.00 °C   
99+
900.00 °C   
99+
Boiling Point
3,902.00 °C   
13
1,470.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silver   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
Not Available   
3.00   
12
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
Np   
Cf   
Isotopes
  
  
Known Isotopes
20   
19
20   
19
Electronegativity
  
  
Pauling Electronegativity
1.36   
29
1.30   
32
Allred Rochow Electronegativity
1.22   
26
1.20   
27
Electropositivity
  
  
Pauling Electropositivity
2.64   
25
2.70   
22
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol   
99+
608.00 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
1,206.00 kJ/mol   
99+
3rd Energy Level
1,997.00 kJ/mol   
99+
2,267.00 kJ/mol   
99+
4th Energy Level
3,242.00 kJ/mol   
99+
3,599.00 kJ/mol   
99+
Electrochemical Equivalent
1.77 g/amp-hr   
39
3.12 g/amp-hr   
15
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
93   
25
98   
20
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Rn] 5f10 7s2   
Crystal Structure
Orthorhombic (ORTH)   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
DHCP-Crystal-Structure-of-Californium.jpg#100   
Atom
  
  
Number of Protons
93   
25
98   
20
Number of Neutrons
144   
14
153   
9
Number of Electrons
93   
25
98   
20
Radius of an Atom
  
  
Atomic Radius
155.00 pm   
30
186.00 pm   
9
Covalent Radius
190.00 pm   
18
Not Available   
Van der Waals Radius
221.00 pm   
22
Not Available   
Atomic Weight
237.00 amu   
22
251.00 amu   
17
Atomic Volume
11.62 cm3/mol   
99+
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Berkelium
  
Next Element
Plutonium
  
Einsteinium
  
Valence Electron Potential
96.00 (-eV)   
9
44.50 (-eV)   
38
Lattice Constant
666.30 pm   
3
338.00 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
19.38 g/cm3   
14
15.10 g/cm3   
21
Tensile Strength
125.00 MPa   
14
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.11 (Pa)   
17
Not Available   
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Ductile   
Malleable, Sectile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
20.25   
6
15.10   
13
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Unknown   
Resistivity
1.22 nΩ·m   
99+
Not Available   
Electrical Conductivity
0.01 106/cm Ω   
99+
Not Available   
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
Not Available   
Molar Heat Capacity
29.46 J/mol·K   
8
Not Available   
Thermal Conductivity
6.30 W/m·K   
99+
Not Available   
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Fusion
3.20 kJ/mol   
99+
Not Available   
Standard Molar Entropy
Not Available   
Not Available   
Periodic Table >>
<< All

Compare Actinide Series

Actinide Metals

Actinide Metals

» More Actinide Metals

Compare Actinide Series

» More Compare Actinide Series
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!