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Thorium vs Curium

Thorium
Curium
Curium vs Thorium


Periodic Table
Symbol
Th  
Cm  
Group Number
0  
18
3  
15
Period Number
7  
7  
Block
f block  
f block  
Element Family
Actinide  
Actinide  
CAS Number
7440326  
99+
7440519  
36
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • 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.
  
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
Sources
Found in Minerals, Mining  
Bombarding Plutonium with Helium Ions  
History
  
  
Who Discovered
Jöns Jakob Berzelius  
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso  
Discovery
In 1829  
In 1944  
Abundance
  
  
Abundance In Universe
0.00 %  
10
0.00 %  
35
Abundance In Sun
0.00 %  
9
0.00 %  
30
Abundance In Meteorites
0.05 %  
11
0.00 %  
99+
Abundance In Earth's Crust
0.66 %  
7
0.00 %  
99+
Abundance In Oceans
0.00 %  
15
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • 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.
  
  • Curium metal is used to provide power to electrical equipment for space missions.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
Dentistry, Surgical Instruments Manufacturing  
-  
Other Uses
Alloys, Jewellery, Sculptures, Statues  
Research Purposes  
Biological Properties
  
  
Toxicity
Non Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
36
0.00 Blood/mg dm-3  
40
In Bone
0.02 p.p.m.  
34
0.00 p.p.m.  
99+
Physical
Melting Point
1,750.00 °C  
17
1,340.00 °C  
34
Boiling Point
4,790.00 °C  
8
3,110.00 °C  
31
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silver  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
3.00  
13
2.00  
17
Brinell Hardness
390.00 MPa  
35
320.00 MPa  
40
Vickers Hardness
295.00 MPa  
99+
461.00 MPa  
37
Speed of Sound
2,490.00 m/s  
99+
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.60  
33
1.30  
99+
Reflectivity
15.00 %  
36
60.00 %  
23
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Th  
Cm  
Isotopes
  
  
Known Isotopes
28  
11
15  
24
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.30  
33
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.11  
30
1.20  
28
Mulliken-Jaffe Electronegativity
1.30  
33
1.30  
33
Allen Electronegativity
1.30  
40
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.70  
22
Ionization Energies
  
  
1st Energy Level
587.00 kJ/mol  
99+
581.00 kJ/mol  
99+
2nd Energy Level
1,110.00 kJ/mol  
99+
1,196.00 kJ/mol  
99+
3rd Energy Level
1,978.00 kJ/mol  
99+
2,026.00 kJ/mol  
99+
4th Energy Level
2,780.00 kJ/mol  
99+
3,550.00 kJ/mol  
99+
5th Energy Level
5,870.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
6th Energy Level
5,870.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
7th Energy level
5,870.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
8th Energy Level
5,870.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
9th Energy Level
5,870.00 kJ/mol  
99+
6,690.00 kJ/mol  
37
10th Energy Level
5,870.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
11th Energy Level
5,870.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
12th Energy Level
5,870.00 kJ/mol  
99+
58,100.00 kJ/mol  
19
13th Energy Level
5,870.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
14th Energy Level
5,870.00 kJ/mol  
38
5,810.00 kJ/mol  
40
15th Energy Level
58,700.00 kJ/mol  
99+
58,100.00 kJ/mol  
99+
16th Energy Level
58,700.00 kJ/mol  
39
58,100.00 kJ/mol  
99+
17th Energy Level
587.40 kJ/mol  
99+
581.00 kJ/mol  
99+
18th Energy Level
5,870.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
19th Energy Level
587.00 kJ/mol  
99+
581.00 kJ/mol  
99+
20th Energy Level
587.00 kJ/mol  
99+
581.00 kJ/mol  
99+
21st Energy Level
587.00 kJ/mol  
99+
5,810.00 kJ/mol  
20
22nd Energy Level
587.00 kJ/mol  
99+
581.00 kJ/mol  
99+
23rd Energy Level
587.00 kJ/mol  
99+
5,810.00 kJ/mol  
20
24th Energy Level
587.00 kJ/mol  
99+
581.00 kJ/mol  
99+
25th Energy Level
587.00 kJ/mol  
99+
581.00 kJ/mol  
99+
26th Energy Level
587.40 kJ/mol  
99+
581.00 kJ/mol  
99+
27th Energy Level
587.40 kJ/mol  
99+
581.00 kJ/mol  
99+
28th Energy Level
587.40 kJ/mol  
99+
581.00 kJ/mol  
99+
29th Energy Level
587.00 kJ/mol  
99+
581.00 kJ/mol  
99+
30th Energy Level
587.40 kJ/mol  
99+
581.00 kJ/mol  
99+
Electrochemical Equivalent
2.16 g/amp-hr  
28
3.07 g/amp-hr  
19
Electron Work Function
3.41 eV  
99+
4.50 eV  
19
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
90  
28
96  
22
Electron Configuration
[Rn] 6d2 7s2  
[Rn] 5f7 6d1 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
FCC-Crystal-Structure-of-Thorium.jpg#100  
DHCP-Crystal-Structure-of-Curium.jpg#100  
Atom
  
  
Number of Protons
90  
28
96  
22
Number of Neutrons
142  
16
151  
11
Number of Electrons
90  
28
96  
22
Radius of an Atom
  
  
Atomic Radius
179.80 pm  
17
174.00 pm  
22
Covalent Radius
206.00 pm  
7
169.00 pm  
28
Van der Waals Radius
237.00 pm  
19
200.00 pm  
35
Atomic Weight
232.04 amu  
23
247.00 amu  
18
Atomic Volume
19.90 cm3/mol  
32
18.28 cm3/mol  
38
Adjacent Atomic Numbers
  
  
Previous Element
Actinium
  
Americium
  
Next Element
Protactinium
  
Berkelium
  
Valence Electron Potential
59.30 (-eV)  
24
44.50 (-eV)  
39
Lattice Constant
508.42 pm  
16
336.25 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.10  
99+
1.67  
11
Mechanical
Density
  
  
Density At Room Temperature
11.72 g/cm3  
34
13.51 g/cm3  
26
Density When Liquid (at m.p.)
11.72 g/cm3  
32
13.85 g/cm3  
25
Tensile Strength
75.00 MPa  
30
350.00 MPa  
12
Viscosity
0.00  
23
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
22
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
31.00 GPa  
25
32.00 GPa  
24
Bulk Modulus
54.00 GPa  
23
40.00 GPa  
38
Young's Modulus
79.00 GPa  
26
0.00 GPa  
99+
Poisson Ratio
0.27  
20
0.35  
9
Other Mechanical Properties
Ductile  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
11.70  
36
13.51  
28
Magnetic Ordering
Paramagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Superconductor  
-  
Resistivity
157.00 nΩ·m  
22
1.25 nΩ·m  
99+
Electrical Conductivity
0.07 106/cm Ω  
36
0.13 106/cm Ω  
19
Electron Affinity
0.00 kJ/mol  
99+
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
26.23 J/mol·K  
38
27.50 J/mol·K  
21
Thermal Conductivity
54.00 W/m·K  
28
11.00 W/m·K  
99+
Critical Temperature
2,023.00 K  
20
1,340.00 K  
99+
Thermal Expansion
11.00 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
429.00 kJ/mol  
20
331.60 kJ/mol  
40
Enthalpy of Fusion
15.48 kJ/mol  
19
15.00 kJ/mol  
22
Enthalpy of Atomization
468.60 kJ/mol  
20
-  
Standard Molar Entropy
27.30 J/mol.K  
99+
52.50 J/mol.K  
36
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