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Lutetium vs Curium

Lutetium
Curium
Curium vs Lutetium


Periodic Table
Symbol
Lu  
Cm  
Group Number
3  
15
3  
15
Period Number
6  
7  
Block
f block  
f block  
Element Family
Lanthanide  
Actinide  
CAS Number
7439943  
99+
7440519  
36
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Metal dust of Lutetium element is highly explosive.
  • Lutetium metal is corrosion resistance and acts stable in air.
  
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Bombarding Plutonium with Helium Ions  
History
  
  
Who Discovered
Georges Urbain and Carl Auer von Welsbach  
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso  
Discovery
In 1906  
In 1944  
Abundance
  
  
Abundance In Universe
0.00 %  
31
0.00 %  
35
Abundance In Sun
0.00 %  
26
0.00 %  
30
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Lutetium metal is used outside research. It has commercial uses like Industrial catalyst for cracking oil refineries of hydrocarbons .
  
  • Curium metal is used to provide power to electrical equipment for space missions.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Research Purposes  
Biological Properties
  
  
Toxicity
Low Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
37
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,652.00 °C  
19
1,340.00 °C  
34
Boiling Point
3,402.00 °C  
20
3,110.00 °C  
31
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
4.50  
10
2.00  
17
Brinell Hardness
893.00 MPa  
11
320.00 MPa  
40
Vickers Hardness
1,160.00 MPa  
14
461.00 MPa  
37
Speed of Sound
5,200.00 m/s  
10
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.90  
18
1.30  
99+
Reflectivity
60.00 %  
23
60.00 %  
23
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Lu  
Cm  
Isotopes
  
  
Known Isotopes
35  
4
15  
24
Electronegativity
  
  
Pauling Electronegativity
1.27  
35
1.30  
33
Sanderson Electronegativity
1.27  
27
1.30  
25
Allred Rochow Electronegativity
1.14  
29
1.20  
28
Mulliken-Jaffe Electronegativity
1.27  
34
1.30  
33
Allen Electronegativity
1.27  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.73  
20
2.70  
22
Ionization Energies
  
  
1st Energy Level
523.50 kJ/mol  
99+
581.00 kJ/mol  
99+
2nd Energy Level
1,340.00 kJ/mol  
99+
1,196.00 kJ/mol  
99+
3rd Energy Level
2,022.30 kJ/mol  
99+
2,026.00 kJ/mol  
99+
4th Energy Level
4,370.00 kJ/mol  
38
3,550.00 kJ/mol  
99+
5th Energy Level
6,445.00 kJ/mol  
34
5,810.00 kJ/mol  
99+
6th Energy Level
5,230.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
7th Energy level
5,230.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
8th Energy Level
5,230.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
9th Energy Level
5,230.00 kJ/mol  
99+
6,690.00 kJ/mol  
37
10th Energy Level
5,230.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
11th Energy Level
5,235.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
12th Energy Level
5,230.00 kJ/mol  
99+
58,100.00 kJ/mol  
19
13th Energy Level
5,230.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
14th Energy Level
5,230.00 kJ/mol  
99+
5,810.00 kJ/mol  
40
15th Energy Level
52,300.00 kJ/mol  
99+
58,100.00 kJ/mol  
99+
16th Energy Level
52,300.00 kJ/mol  
99+
58,100.00 kJ/mol  
99+
17th Energy Level
523.50 kJ/mol  
99+
581.00 kJ/mol  
99+
18th Energy Level
5,230.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
19th Energy Level
523.50 kJ/mol  
99+
581.00 kJ/mol  
99+
20th Energy Level
523.00 kJ/mol  
99+
581.00 kJ/mol  
99+
21st Energy Level
523.50 kJ/mol  
99+
5,810.00 kJ/mol  
20
22nd Energy Level
523.00 kJ/mol  
99+
581.00 kJ/mol  
99+
23rd Energy Level
5,230.00 kJ/mol  
28
5,810.00 kJ/mol  
20
24th Energy Level
523.50 kJ/mol  
99+
581.00 kJ/mol  
99+
25th Energy Level
523.00 kJ/mol  
99+
581.00 kJ/mol  
99+
26th Energy Level
523.50 kJ/mol  
99+
581.00 kJ/mol  
99+
27th Energy Level
523.50 kJ/mol  
99+
581.00 kJ/mol  
99+
28th Energy Level
523.50 kJ/mol  
99+
581.00 kJ/mol  
99+
29th Energy Level
523.50 kJ/mol  
99+
581.00 kJ/mol  
99+
30th Energy Level
523.00 kJ/mol  
99+
581.00 kJ/mol  
99+
Electrochemical Equivalent
2.18 g/amp-hr  
27
3.07 g/amp-hr  
19
Electron Work Function
3.30 eV  
99+
4.50 eV  
19
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
71  
99+
96  
22
Electron Configuration
[Xe] 6s2 4f14 5d1  
[Rn] 5f7 6d1 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
DHCP-Crystal-Structure-of-Curium.jpg#100  
Atom
  
  
Number of Protons
71  
99+
96  
22
Number of Neutrons
104  
31
151  
11
Number of Electrons
71  
99+
96  
22
Radius of an Atom
  
  
Atomic Radius
174.00 pm  
22
174.00 pm  
22
Covalent Radius
187.00 pm  
20
169.00 pm  
28
Van der Waals Radius
221.00 pm  
27
200.00 pm  
35
Atomic Weight
174.97 amu  
40
247.00 amu  
18
Atomic Volume
17.78 cm3/mol  
99+
18.28 cm3/mol  
38
Adjacent Atomic Numbers
  
  
Previous Element
Ytterbium
  
Americium
  
Next Element
Hafnium
  
Berkelium
  
Valence Electron Potential
50.90 (-eV)  
27
44.50 (-eV)  
39
Lattice Constant
350.31 pm  
99+
336.25 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.59  
32
1.67  
11
Mechanical
Density
  
  
Density At Room Temperature
9.84 g/cm3  
99+
13.51 g/cm3  
26
Density When Liquid (at m.p.)
9.30 g/cm3  
99+
13.85 g/cm3  
25
Tensile Strength
230.00 MPa  
18
350.00 MPa  
12
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
35
0.00 (Pa)  
22
Vapor Pressure at 2000 K
3.18 (Pa)  
11
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
27.20 GPa  
33
32.00 GPa  
24
Bulk Modulus
47.60 GPa  
25
40.00 GPa  
38
Young's Modulus
68.60 GPa  
32
0.00 GPa  
99+
Poisson Ratio
0.26  
21
0.35  
9
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.84  
99+
13.51  
28
Magnetic Ordering
Paramagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
17
Susceptibility
0.00  
14
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
582.00 nΩ·m  
9
1.25 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.13 106/cm Ω  
19
Electron Affinity
50.00 kJ/mol  
26
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.15 J/(kg K)  
37
0.10 J/(kg K)  
99+
Molar Heat Capacity
26.86 J/mol·K  
31
27.50 J/mol·K  
21
Thermal Conductivity
16.40 W/m·K  
99+
11.00 W/m·K  
99+
Critical Temperature
1,925.00 K  
23
1,340.00 K  
99+
Thermal Expansion
9.90 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
355.90 kJ/mol  
32
331.60 kJ/mol  
40
Enthalpy of Fusion
18.70 kJ/mol  
13
15.00 kJ/mol  
22
Enthalpy of Atomization
398.00 kJ/mol  
26
-  
Standard Molar Entropy
51.00 J/mol.K  
99+
52.50 J/mol.K  
36
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