Californium vs Thorium
Periodic Table
Symbol
Cf
Th
Group Number
Not Available
0
18
Period Number
7
7
Block
f block
f block
Element Family
Actinide
Actinide
CAS Number
7440713
20
7440326
99+
Space Group Name
P63/mmc
P63/mmc
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.
- Thorium metal is used as an alternate option over Uranium for nuclear fuel.
- Thorium metals appearance (silvery white, soft) is somewhat similar to Lead metal.
Sources
Made by Bombarding Curium with Helium Ions
Found in Minerals, Mining
History
Who Discovered
Lawrence Berkeley National Laboratory
Jöns Jakob Berzelius
Discovery
In 1950
In 1829
Abundance
Abundance In Universe
Not Available
3 * 10-4 %
9
Abundance In Sun
~-9999 %
~0.0004 %
9
Abundance In Meteorites
Not Available
0.05 %
11
Abundance In Earth's Crust
Not Available
0.66 %
7
Abundance In Oceans
Not Available
0.00 %
15
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.
- Thorium metal is used as an allying agent for Magnesium, It imparts greater strength and resistance to temperature.
- compound of this metal Thorium oxide is used as an industrial catalyst.
Industrial Uses
Chemical Industry
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
Dentistry, Surgical Instruments Manufacturing
Other Uses
Alloys, Nuclear Research
Alloys, Jewellery, Sculptures, Statues
Biological Properties
Toxicity
Toxic
Non Toxic
Present in Human Body
No
Yes
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
33
In Bone
0.00 p.p.m.
36
0.02 p.p.m.
29
Physical Properties
Melting Point
900.00 °C
99+
1,750.00 °C
17
Boiling Point
1,470.00 °C
99+
4,790.00 °C
8
Appearance
Physical State
Solid
Solid
Color
Silver
Silver
Luster
NA
NA
Hardness
Mohs Hardness
3.00
12
3.00
12
Brinell Hardness
Not Available
390.00 MPa
29
Vickers Hardness
Not Available
295.00 MPa
29
Speed of Sound
Not Available
2,490.00 m/s
36
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
Th
Isotopes
Known Isotopes
20
19
28
11
Electronegativity
Pauling Electronegativity
1.30
32
1.30
32
Allred Rochow Electronegativity
1.20
27
1.11
29
Electropositivity
Pauling Electropositivity
2.70
22
2.70
22
Ionization Energies
1st Energy Level
608.00 kJ/mol
99+
587.00 kJ/mol
99+
2nd Energy Level
1,206.00 kJ/mol
99+
1,110.00 kJ/mol
99+
3rd Energy Level
2,267.00 kJ/mol
99+
1,978.00 kJ/mol
99+
4th Energy Level
3,599.00 kJ/mol
99+
2,780.00 kJ/mol
99+
Electrochemical Equivalent
3.12 g/amp-hr
15
2.16 g/amp-hr
24
Electron Work Function
Not Available
3.41 eV
32
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Corrosion, Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
98
20
90
28
Electron Configuration
[Rn] 5f10 7s2
[Rn] 6d2 7s2
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Face Centered Cubic (FCC)
Crystal Lattice
DHCP-Crystal-Structure-of-Californium.jpg#100
FCC-Crystal-Structure-of-Thorium.jpg#100
Atom
Number of Protons
98
20
90
28
Number of Neutrons
153
9
142
15
Number of Electrons
98
20
90
28
Radius of an Atom
Atomic Radius
186.00 pm
9
179.80 pm
15
Covalent Radius
Not Available
206.00 pm
7
Van der Waals Radius
Not Available
237.00 pm
15
Atomic Weight
251.00 amu
17
232.04 amu
23
Atomic Volume
Not Available
19.90 cm3/mol
20
Adjacent Atomic Numbers
Valence Electron Potential
44.50 (-eV)
38
59.30 (-eV)
23
Lattice Constant
338.00 pm
99+
508.42 pm
14
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
15.10 g/cm3
21
11.72 g/cm3
32
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
Not Available
0.00 (Pa)
22
Elasticity properties
Shear Modulus
Not Available
31.00 GPa
21
Bulk Modulus
Not Available
54.00 GPa
22
Young's Modulus
Not Available
79.00 GPa
24
Poisson Ratio
Not Available
0.27
20
Other Mechanical Properties
Malleable, Sectile
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
15.10
13
11.70
23
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Superconductor
Resistivity
Not Available
157.00 nΩ·m
22
Electrical Conductivity
Not Available
0.07 106/cm Ω
31
Thermal Properties
Specific Heat
Not Available
0.12 J/(kg K)
40
Molar Heat Capacity
Not Available
26.23 J/mol·K
30
Thermal Conductivity
Not Available
54.00 W/m·K
28
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
11.00 µm/(m·K)
36
Enthalpy
Enthalpy of Vaporization
Not Available
429.00 kJ/mol
15
Enthalpy of Fusion
Not Available
15.48 kJ/mol
19
Enthalpy of Atomization
Not Available
468.60 kJ/mol
15
Standard Molar Entropy
Not Available
27.30 J/mol.K
99+
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