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Promethium vs Erbium

Promethium
Erbium
Erbium vs Promethium


Periodic Table
Symbol
Pm  
Er  
Group Number
3  
15
3  
15
Period Number
6  
6  
Block
f block  
f block  
Element Family
Lanthanide  
Lanthanide  
CAS Number
7440122  
99+
7440520  
35
Space Group Name
-  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
  • Erbium metal is used as alloyed with Vanadium to make it softer.
  • Recent studies shows that it is helpful for metabolism.
  
Sources
Found in Minerals, Mining  
Mining  
History
  
  
Who Discovered
Chien Shiung Wu, Emilio Segrè, Hans Bethe  
Carl Gustaf Mosander  
Discovery
In 1942  
In 1842  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
23
Abundance In Sun
-  
0.00 %  
26
Abundance In Meteorites
-  
0.00 %  
36
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
32
Abundance In Oceans
-  
0.00 %  
36
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • It is used for research purpose. Very small amount of this metal is used in atomic batteries.
  • Its radioactive decay is used for a phosphor to give off light. The light emitted is converted into electricity.
  
  • 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.
  
Industrial Uses
-  
Chemical Industry  
Medical Uses
-  
-  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
Non Toxic  
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
1,042.00 °C  
99+
1,522.00 °C  
28
Boiling Point
3,000.00 °C  
32
2,510.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Silvery White  
Luster
Metallic  
Lustrous  
Hardness
  
  
Mohs Hardness
-  
1.00  
22
Brinell Hardness
400.00 MPa  
34
814.00 MPa  
12
Vickers Hardness
600.00 MPa  
28
589.00 MPa  
30
Speed of Sound
2,260.00 m/s  
99+
2,830.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.70  
27
1.76  
24
Reflectivity
63.00 %  
20
36.00 %  
33
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Pm  
Er  
Isotopes
  
  
Known Isotopes
27  
12
31  
8
Electronegativity
  
  
Pauling Electronegativity
1.13  
99+
1.24  
37
Sanderson Electronegativity
1.13  
36
1.24  
29
Allred Rochow Electronegativity
1.07  
33
1.11  
30
Mulliken-Jaffe Electronegativity
1.13  
99+
1.24  
36
Allen Electronegativity
1.13  
99+
1.24  
99+
Electropositivity
  
  
Pauling Electropositivity
2.20  
39
2.76  
18
Ionization Energies
  
  
1st Energy Level
540.00 kJ/mol  
99+
589.30 kJ/mol  
99+
2nd Energy Level
1,050.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
3rd Energy Level
2,150.00 kJ/mol  
99+
2,194.00 kJ/mol  
99+
4th Energy Level
3,970.00 kJ/mol  
99+
4,120.00 kJ/mol  
99+
5th Energy Level
5,400.00 kJ/mol  
99+
5,897.00 kJ/mol  
99+
6th Energy Level
5,400.00 kJ/mol  
99+
5,897.00 kJ/mol  
99+
7th Energy level
5,400.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
8th Energy Level
5,400.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
9th Energy Level
5,400.00 kJ/mol  
99+
4,240.00 kJ/mol  
99+
10th Energy Level
5,400.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
11th Energy Level
5,400.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
12th Energy Level
5,400.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
13th Energy Level
5,400.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
14th Energy Level
5,400.00 kJ/mol  
99+
5,890.00 kJ/mol  
37
15th Energy Level
54,000.00 kJ/mol  
99+
58,900.00 kJ/mol  
99+
16th Energy Level
54,000.00 kJ/mol  
99+
58,900.00 kJ/mol  
38
17th Energy Level
540.50 kJ/mol  
99+
589.30 kJ/mol  
99+
18th Energy Level
5,400.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
19th Energy Level
540.00 kJ/mol  
99+
589.30 kJ/mol  
99+
20th Energy Level
540.00 kJ/mol  
99+
589.00 kJ/mol  
99+
21st Energy Level
540.00 kJ/mol  
99+
5,897.00 kJ/mol  
19
22nd Energy Level
540.00 kJ/mol  
99+
589.00 kJ/mol  
99+
23rd Energy Level
540.00 kJ/mol  
99+
589.30 kJ/mol  
99+
24th Energy Level
540.00 kJ/mol  
99+
589.30 kJ/mol  
99+
25th Energy Level
540.00 kJ/mol  
99+
589.00 kJ/mol  
99+
26th Energy Level
540.00 kJ/mol  
99+
589.30 kJ/mol  
99+
27th Energy Level
540.00 kJ/mol  
99+
589.30 kJ/mol  
99+
28th Energy Level
540.00 kJ/mol  
99+
589.30 kJ/mol  
99+
29th Energy Level
540.00 kJ/mol  
99+
589.30 kJ/mol  
99+
30th Energy Level
540.00 kJ/mol  
99+
589.70 kJ/mol  
99+
Electrochemical Equivalent
1.80 g/amp-hr  
40
2.08 g/amp-hr  
32
Electron Work Function
5.30 eV  
5
5.93 eV  
2
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
61  
99+
68  
99+
Electron Configuration
[Xe] 4f5 6s2  
[Xe] 4f12 6s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100  
HCP-Crystal-Structure-of-Erbium.jpg#100  
Atom
  
  
Number of Protons
61  
99+
68  
99+
Number of Neutrons
84  
99+
99  
34
Number of Electrons
61  
99+
68  
99+
Radius of an Atom
  
  
Atomic Radius
183.00 pm  
12
176.00 pm  
20
Covalent Radius
199.00 pm  
12
189.00 pm  
19
Van der Waals Radius
236.00 pm  
20
0.00 pm  
99+
Atomic Weight
145.00 amu  
99+
167.26 amu  
99+
Atomic Volume
22.39 cm3/mol  
21
18.40 cm3/mol  
37
Adjacent Atomic Numbers
  
  
Previous Element
Neodymium
  
Holmium
  
Next Element
Samarium
  
Thulium
  
Valence Electron Potential
44.10 (-eV)  
40
49.00 (-eV)  
30
Lattice Constant
-  
355.88 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.63  
14
1.57  
40
Mechanical
Density
  
  
Density At Room Temperature
7.26 g/cm3  
99+
9.07 g/cm3  
99+
Density When Liquid (at m.p.)
7.26 g/cm3  
99+
8.86 g/cm3  
99+
Tensile Strength
75.00 MPa  
30
350.00 MPa  
12
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
21
Vapor Pressure at 2000 K
0.00 (Pa)  
31
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
18.00 GPa  
99+
28.30 GPa  
31
Bulk Modulus
33.00 GPa  
99+
44.40 GPa  
31
Young's Modulus
46.00 GPa  
99+
69.90 GPa  
31
Poisson Ratio
0.28  
17
0.24  
28
Other Mechanical Properties
-  
Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.26  
99+
9.07  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
11
0.00 H/m  
17
Susceptibility
0.00  
25
0.00  
11
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
0.75 nΩ·m  
99+
0.86 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
50.00 kJ/mol  
26
Thermal
Specific Heat
0.18 J/(kg K)  
34
0.17 J/(kg K)  
35
Molar Heat Capacity
27.60 J/mol·K  
20
28.12 J/mol·K  
14
Thermal Conductivity
17.90 W/m·K  
99+
14.50 W/m·K  
99+
Critical Temperature
1,315.00 K  
99+
1,802.00 K  
30
Thermal Expansion
9.00 µm/(m·K)  
99+
12.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
289.00 kJ/mol  
99+
261.00 kJ/mol  
99+
Enthalpy of Fusion
7.50 kJ/mol  
99+
17.20 kJ/mol  
15
Enthalpy of Atomization
310.00 kJ/mol  
99+
314.00 kJ/mol  
99+
Standard Molar Entropy
57.00 J/mol.K  
30
73.10 J/mol.K  
11
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