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Promethium vs Neodymium

Promethium
Neodymium
Neodymium vs Promethium


Periodic Table
Symbol
Pm   
Nd   
Group Number
Not Available   
1   
17
Period Number
6   
6   
Block
f block   
f block   
Element Family
Lanthanide   
Lanthanide   
CAS Number
7440122   
99+
7440008   
99+
Space Group Name
Not Available   
P63/mmc   
Space Group Number
Not Available   
194.00   
5
Facts
Interesting Facts
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
  • Neodymium is not found free in nature, hence it is not a native metal.
  • Neodymium metal found in minerals like Monazite and Bastnaesite.
  
Sources
Found in Minerals, Mining   
Found in Minerals, Mining   
History
  
  
Who Discovered
Chien Shiung Wu, Emilio Segrè, Hans Bethe   
Carl Auer von Welsbach   
Discovery
In 1942   
In 1885   
Abundance
  
  
Abundance In Universe
Not Available   
1 * 10-6 %   
16
Abundance In Sun
~-9999 %   
~0.0000003 %   
24
Abundance In Meteorites
Not Available   
0.00 %   
30
Abundance In Earth's Crust
Not Available   
0.00 %   
20
Abundance In Oceans
Not Available   
0.00 %   
30
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.
  
  • Neodymium-Iron-boron alloy is used to make permanent magnets.
  • It is used in microphones, Mp3 player, loudspeakers, mobile phones, etc.
  
Industrial Uses
NA   
Aerospace Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
Non Toxic   
Non Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
Physical Properties
Melting Point
1,042.00 °C   
99+
1,010.00 °C   
99+
Boiling Point
3,000.00 °C   
31
3,127.00 °C   
28
Appearance
  
  
Physical State
Solid   
Solid   
Color
Unknown   
Silvery White   
Luster
Metallic   
Metallic   
Hardness
  
  
Brinell Hardness
Not Available   
265.00 MPa   
35
Vickers Hardness
Not Available   
345.00 MPa   
27
Speed of Sound
Not Available   
2,330.00 m/s   
38
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
Pm   
Nd   
Isotopes
  
  
Known Isotopes
27   
12
30   
9
Electronegativity
  
  
Pauling Electronegativity
Not Available   
1.14   
99+
Allred Rochow Electronegativity
1.07   
32
1.07   
32
Electropositivity
  
  
Pauling Electropositivity
Not Available   
2.86   
13
Ionization Energies
  
  
1st Energy Level
540.00 kJ/mol   
99+
533.10 kJ/mol   
99+
2nd Energy Level
1,050.00 kJ/mol   
99+
1,040.00 kJ/mol   
99+
3rd Energy Level
2,150.00 kJ/mol   
99+
2,130.00 kJ/mol   
99+
4th Energy Level
3,970.00 kJ/mol   
38
3,900.00 kJ/mol   
99+
Electrochemical Equivalent
1.80 g/amp-hr   
36
1.79 g/amp-hr   
37
Electron Work Function
Not Available   
3.20 eV   
34
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Chemical Stability, Corrosion, Flammable, Ionization   
Atomic Properties
Atomic Number
61   
99+
60   
99+
Electron Configuration
[Xe] 4f5 6s2   
[Xe] 4f4 6s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100   
DHCP-Crystal-Structure-of-Neodymium.jpg#100   
Atom
  
  
Number of Protons
61   
99+
60   
99+
Number of Neutrons
84   
40
84   
40
Number of Electrons
61   
99+
60   
99+
Radius of an Atom
  
  
Atomic Radius
183.00 pm   
10
181.00 pm   
13
Covalent Radius
199.00 pm   
12
201.00 pm   
10
Van der Waals Radius
236.00 pm   
16
229.00 pm   
20
Atomic Weight
145.00 amu   
99+
144.24 amu   
99+
Atomic Volume
22.39 cm3/mol   
12
20.60 cm3/mol   
18
Adjacent Atomic Numbers
  
  
Previous Element
Neodymium
  
Praseodymium
  
Next Element
Samarium
  
Promethium
  
Valence Electron Potential
44.10 (-eV)   
39
43.40 (-eV)   
99+
Lattice Constant
Not Available   
365.80 pm   
30
Lattice Angles
Unknown   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.61   
4
Mechanical Properties
Density
  
  
Density At Room Temperature
7.26 g/cm3   
99+
7.01 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
6.89 g/cm3   
36
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
21
Vapor Pressure at 2000 K
Not Available   
101.00 (Pa)   
2
Elasticity properties
  
  
Shear Modulus
18.00 GPa   
36
16.30 GPa   
38
Bulk Modulus
33.00 GPa   
36
31.80 GPa   
37
Young's Modulus
46.00 GPa   
38
41.40 GPa   
40
Poisson Ratio
0.28   
17
0.28   
16
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.26   
99+
7.00   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
0.75 nΩ·m   
99+
643.00 nΩ·m   
6
Electrical Conductivity
Not Available   
0.02 106/cm Ω   
99+
Electron Affinity
50.00 kJ/mol   
21
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.18 J/(kg K)   
33
0.19 J/(kg K)   
32
Molar Heat Capacity
Not Available   
27.45 J/mol·K   
17
Thermal Conductivity
17.90 W/m·K   
99+
16.50 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.00 µm/(m·K)   
99+
9.60 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
273.00 kJ/mol   
34
Enthalpy of Fusion
7.50 kJ/mol   
99+
7.14 kJ/mol   
99+
Enthalpy of Atomization
310.00 kJ/mol   
34
322.00 kJ/mol   
32
Standard Molar Entropy
Not Available   
71.50 J/mol.K   
13
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