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Erbium vs Curium

Erbium
Curium
Curium vs Erbium


Periodic Table
Symbol
Er  
Cm  
Group Number
3  
15
3  
15
Period Number
6  
7  
Block
f block  
f block  
Element Family
Lanthanide  
Actinide  
CAS Number
7440520  
35
7440519  
36
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Erbium metal is used as alloyed with Vanadium to make it softer.
  • Recent studies shows that it is helpful for metabolism.
  
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
Sources
Mining  
Bombarding Plutonium with Helium Ions  
History
  
  
Who Discovered
Carl Gustaf Mosander  
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso  
Discovery
In 1842  
In 1944  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
35
Abundance In Sun
0.00 %  
26
0.00 %  
30
Abundance In Meteorites
0.00 %  
36
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
32
0.00 %  
99+
Abundance In Oceans
0.00 %  
36
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • It has a tendency to get tarnished in the open air, but when alloyed with elements like erbium, vanadium, its hardness levels decreases.
  • Its compounds like Erbium oxide is used in safety glasses of welders and metal workers.
  
  • Curium metal is used to provide power to electrical equipment for space missions.
  
Industrial Uses
Chemical Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Research Purposes  
Biological Properties
  
  
Toxicity
Mildly Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,522.00 °C  
28
1,340.00 °C  
34
Boiling Point
2,510.00 °C  
99+
3,110.00 °C  
31
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Lustrous  
Metallic  
Hardness
  
  
Mohs Hardness
1.00  
22
2.00  
17
Brinell Hardness
814.00 MPa  
12
320.00 MPa  
40
Vickers Hardness
589.00 MPa  
30
461.00 MPa  
37
Speed of Sound
2,830.00 m/s  
99+
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.76  
24
1.30  
99+
Reflectivity
36.00 %  
33
60.00 %  
23
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Er  
Cm  
Isotopes
  
  
Known Isotopes
31  
8
15  
24
Electronegativity
  
  
Pauling Electronegativity
1.24  
37
1.30  
33
Sanderson Electronegativity
1.24  
29
1.30  
25
Allred Rochow Electronegativity
1.11  
30
1.20  
28
Mulliken-Jaffe Electronegativity
1.24  
36
1.30  
33
Allen Electronegativity
1.24  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.76  
18
2.70  
22
Ionization Energies
  
  
1st Energy Level
589.30 kJ/mol  
99+
581.00 kJ/mol  
99+
2nd Energy Level
1,150.00 kJ/mol  
99+
1,196.00 kJ/mol  
99+
3rd Energy Level
2,194.00 kJ/mol  
99+
2,026.00 kJ/mol  
99+
4th Energy Level
4,120.00 kJ/mol  
99+
3,550.00 kJ/mol  
99+
5th Energy Level
5,897.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
6th Energy Level
5,897.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
7th Energy level
5,890.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
8th Energy Level
5,890.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
9th Energy Level
4,240.00 kJ/mol  
99+
6,690.00 kJ/mol  
37
10th Energy Level
5,890.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
11th Energy Level
5,890.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
12th Energy Level
5,890.00 kJ/mol  
99+
58,100.00 kJ/mol  
19
13th Energy Level
5,890.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
14th Energy Level
5,890.00 kJ/mol  
37
5,810.00 kJ/mol  
40
15th Energy Level
58,900.00 kJ/mol  
99+
58,100.00 kJ/mol  
99+
16th Energy Level
58,900.00 kJ/mol  
38
58,100.00 kJ/mol  
99+
17th Energy Level
589.30 kJ/mol  
99+
581.00 kJ/mol  
99+
18th Energy Level
5,890.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
19th Energy Level
589.30 kJ/mol  
99+
581.00 kJ/mol  
99+
20th Energy Level
589.00 kJ/mol  
99+
581.00 kJ/mol  
99+
21st Energy Level
5,897.00 kJ/mol  
19
5,810.00 kJ/mol  
20
22nd Energy Level
589.00 kJ/mol  
99+
581.00 kJ/mol  
99+
23rd Energy Level
589.30 kJ/mol  
99+
5,810.00 kJ/mol  
20
24th Energy Level
589.30 kJ/mol  
99+
581.00 kJ/mol  
99+
25th Energy Level
589.00 kJ/mol  
99+
581.00 kJ/mol  
99+
26th Energy Level
589.30 kJ/mol  
99+
581.00 kJ/mol  
99+
27th Energy Level
589.30 kJ/mol  
99+
581.00 kJ/mol  
99+
28th Energy Level
589.30 kJ/mol  
99+
581.00 kJ/mol  
99+
29th Energy Level
589.30 kJ/mol  
99+
581.00 kJ/mol  
99+
30th Energy Level
589.70 kJ/mol  
99+
581.00 kJ/mol  
99+
Electrochemical Equivalent
2.08 g/amp-hr  
32
3.07 g/amp-hr  
19
Electron Work Function
5.93 eV  
2
4.50 eV  
19
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
68  
99+
96  
22
Electron Configuration
[Xe] 4f12 6s2  
[Rn] 5f7 6d1 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
HCP-Crystal-Structure-of-Erbium.jpg#100  
DHCP-Crystal-Structure-of-Curium.jpg#100  
Atom
  
  
Number of Protons
68  
99+
96  
22
Number of Neutrons
99  
34
151  
11
Number of Electrons
68  
99+
96  
22
Radius of an Atom
  
  
Atomic Radius
176.00 pm  
20
174.00 pm  
22
Covalent Radius
189.00 pm  
19
169.00 pm  
28
Van der Waals Radius
0.00 pm  
99+
200.00 pm  
35
Atomic Weight
167.26 amu  
99+
247.00 amu  
18
Atomic Volume
18.40 cm3/mol  
37
18.28 cm3/mol  
38
Adjacent Atomic Numbers
  
  
Previous Element
Holmium
  
Americium
  
Next Element
Thulium
  
Berkelium
  
Valence Electron Potential
49.00 (-eV)  
30
44.50 (-eV)  
39
Lattice Constant
355.88 pm  
99+
336.25 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.57  
40
1.67  
11
Mechanical
Density
  
  
Density At Room Temperature
9.07 g/cm3  
99+
13.51 g/cm3  
26
Density When Liquid (at m.p.)
8.86 g/cm3  
99+
13.85 g/cm3  
25
Tensile Strength
350.00 MPa  
12
350.00 MPa  
12
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
21
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
28.30 GPa  
31
32.00 GPa  
24
Bulk Modulus
44.40 GPa  
31
40.00 GPa  
38
Young's Modulus
69.90 GPa  
31
0.00 GPa  
99+
Poisson Ratio
0.24  
28
0.35  
9
Other Mechanical Properties
Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.07  
99+
13.51  
28
Magnetic Ordering
Paramagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
11
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
0.86 nΩ·m  
99+
1.25 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.13 106/cm Ω  
19
Electron Affinity
50.00 kJ/mol  
26
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.17 J/(kg K)  
35
0.10 J/(kg K)  
99+
Molar Heat Capacity
28.12 J/mol·K  
14
27.50 J/mol·K  
21
Thermal Conductivity
14.50 W/m·K  
99+
11.00 W/m·K  
99+
Critical Temperature
1,802.00 K  
30
1,340.00 K  
99+
Thermal Expansion
12.20 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
261.00 kJ/mol  
99+
331.60 kJ/mol  
40
Enthalpy of Fusion
17.20 kJ/mol  
15
15.00 kJ/mol  
22
Enthalpy of Atomization
314.00 kJ/mol  
99+
-  
Standard Molar Entropy
73.10 J/mol.K  
11
52.50 J/mol.K  
36
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