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Roentgenium vs Praseodymium

Roentgenium
Praseodymium
Praseodymium vs Roentgenium


Periodic Table
Symbol
Rg   
Pr   
Group Number
11   
7
Not Available   
Period Number
7   
6   
Block
d block   
f block   
Element Family
Unknown   
Lanthanide   
CAS Number
54386242   
1
7440100   
99+
Space Group Name
Not Available   
P63/mmc   
Space Group Number
194.00   
5
194.00   
5
Facts
Interesting Facts
Not Available   
  • Praseodymium metal is synthetically produced metal.
  • Praseodymium is used as possible fuel for radioactive generators.
  
Sources
Synthetically Produced   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung   
Not Available   
Discovery
In 1994   
In 1885   
Abundance
  
  
Abundance In Universe
Not Available   
2 * 10-7 %   
22
Abundance In Sun
~-9999 %   
~0.0000001 %   
26
Abundance In Meteorites
Not Available   
0.00 %   
40
Abundance In Earth's Crust
Not Available   
0.00 %   
27
Abundance In Oceans
Not Available   
0.00 %   
39
Uses
Uses & Benefits
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
  • The main use of Praseodymium include alloys. Praseodymium –Magnesium alloy is used in aircraft engines due to its high strength.
  • This metal is also used while making a permanent magnets.
  
Industrial Uses
NA   
Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Unknown   
Moderately Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
Not Available   
935.00 °C   
99+
Boiling Point
Not Available   
3,130.00 °C   
27
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Grayish White   
Luster
Unknown Luster   
Metallic   
Hardness
  
  
Brinell Hardness
Not Available   
481.00 MPa   
24
Vickers Hardness
Not Available   
400.00 MPa   
25
Speed of Sound
Not Available   
2,280.00 m/s   
40
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
Rg   
Pr   
Isotopes
  
  
Known Isotopes
1   
34
31   
8
Electronegativity
  
  
Pauling Electronegativity
Not Available   
1.13   
99+
Allred Rochow Electronegativity
Not Available   
1.07   
32
Electropositivity
  
  
Pauling Electropositivity
Not Available   
2.87   
12
Ionization Energies
  
  
1st Energy Level
1,022.70 kJ/mol   
3
527.00 kJ/mol   
99+
2nd Energy Level
2,074.40 kJ/mol   
10
1,020.00 kJ/mol   
99+
3rd Energy Level
3,077.90 kJ/mol   
24
2,086.00 kJ/mol   
99+
4th Energy Level
4,052.40 kJ/mol   
36
3,761.00 kJ/mol   
99+
5th Energy Level
5,306.70 kJ/mol   
31
5,551.00 kJ/mol   
29
Electrochemical Equivalent
Not Available   
1.75 g/amp-hr   
40
Electron Work Function
Not Available   
2.70 eV   
99+
Other Chemical Properties
NA   
Anti Corrosion, Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
111   
7
59   
99+
Electron Configuration
[Rn] 5f14 6d9 7s2   
[Xe] 4f3 6s2   
Crystal Structure
Body Centered Cubic (BCC)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
HCP-Crystal-Structure-of-Praseodymium.jpg#100   
Atom
  
  
Number of Protons
111   
7
59   
99+
Number of Neutrons
161   
3
82   
99+
Number of Electrons
111   
7
59   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
182.00 pm   
11
Covalent Radius
Not Available   
203.00 pm   
9
Van der Waals Radius
Not Available   
239.00 pm   
14
Atomic Weight
281.00 amu   
6
140.91 amu   
99+
Atomic Volume
Not Available   
20.80 cm3/mol   
15
Adjacent Atomic Numbers
  
  
Previous Element
Darmstadtium
  
Cerium
  
Next Element
Copernicium
  
Neodymium
  
Valence Electron Potential
Not Available   
42.64 (-eV)   
99+
Lattice Constant
Not Available   
367.25 pm   
29
Lattice Angles
NA   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.61   
4
Mechanical Properties
Density
  
  
Density At Room Temperature
28.70 g/cm3   
6
6.77 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
6.50 g/cm3   
39
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
25
Vapor Pressure at 2000 K
Not Available   
13.20 (Pa)   
7
Elasticity properties
  
  
Shear Modulus
Not Available   
14.80 GPa   
39
Bulk Modulus
Not Available   
28.80 GPa   
40
Young's Modulus
Not Available   
37.30 GPa   
99+
Poisson Ratio
Not Available   
0.28   
16
Other Mechanical Properties
Unknown   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
6.77   
99+
Magnetic Ordering
Unknown   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
Not Available   
0.70 nΩ·m   
99+
Electrical Conductivity
Not Available   
0.01 106/cm Ω   
99+
Electron Affinity
Not Available   
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
Not Available   
0.19 J/(kg K)   
32
Molar Heat Capacity
Not Available   
27.20 J/mol·K   
18
Thermal Conductivity
Not Available   
12.50 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
6.70 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
296.80 kJ/mol   
29
Enthalpy of Fusion
Not Available   
6.89 kJ/mol   
99+
Enthalpy of Atomization
Not Available   
368.00 kJ/mol   
24
Standard Molar Entropy
Not Available   
73.20 J/mol.K   
10
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