Dysprosium Praseodymium Comparison
Periodic Table
Symbol
Dy
Pr
Group Number
Not Available
Not Available
Period Number
6
6
Block
f block
f block
Element Family
Lanthanide
Lanthanide
CAS Number
7429916
99+
7440100
99+
Space Group Name
P63/mmc
P63/mmc
Space Group Number
194.00
5
194.00
5
Facts
Interesting Facts
- Dysprosium acts stable in air at room temperature.
- Dysprosium behaves very much like paramagnetic metal.
- Praseodymium metal is synthetically produced metal.
- Praseodymium is used as possible fuel for radioactive generators.
Sources
Found in Minerals, Mining, Ores of Minerals
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Lecoq de Boisbaudran
Not Available
Discovery
In 1886
In 1885
Abundance
Abundance In Universe
2 * 10-7 %
22
2 * 10-7 %
22
Abundance In Sun
~0.0000002 %
25
~0.0000001 %
26
Abundance In Meteorites
0.00 %
33
0.00 %
40
Abundance In Earth's Crust
0.00 %
28
0.00 %
27
Abundance In Oceans
0.00 %
35
0.00 %
39
Uses
Uses & Benefits
- Dysprosium metal is highly reactive due to which it pure form is not as usual as its alloy.
- Thi metals alloy is used in magnate as it is resistance to high temperature.
- 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
Alloys, Nuclear Research
Alloys
Biological Properties
Toxicity
Mildly Toxic
Moderately Toxic
Present in Human Body
No
No
Physical Properties
Melting Point
1,407.00 °C
32
935.00 °C
99+
Boiling Point
2,562.00 °C
99+
3,130.00 °C
27
Appearance
Physical State
Solid
Solid
Color
Silvery White
Grayish White
Luster
Metallic
Metallic
Hardness
Brinell Hardness
500.00 MPa
23
481.00 MPa
24
Vickers Hardness
540.00 MPa
20
400.00 MPa
25
Speed of Sound
2,710.00 m/s
33
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
Dy
Pr
Isotopes
Known Isotopes
29
10
31
8
Electronegativity
Pauling Electronegativity
1.22
38
1.13
99+
Allred Rochow Electronegativity
1.10
30
1.07
32
Electropositivity
Pauling Electropositivity
2.78
16
2.87
12
Ionization Energies
1st Energy Level
573.00 kJ/mol
99+
527.00 kJ/mol
99+
2nd Energy Level
1,130.00 kJ/mol
99+
1,020.00 kJ/mol
99+
3rd Energy Level
2,200.00 kJ/mol
99+
2,086.00 kJ/mol
99+
4th Energy Level
3,990.00 kJ/mol
37
3,761.00 kJ/mol
99+
5th Energy Level
Not Available
5,551.00 kJ/mol
29
Electrochemical Equivalent
2.02 g/amp-hr
29
1.75 g/amp-hr
40
Electron Work Function
Not Available
2.70 eV
99+
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility
Anti Corrosion, Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
66
99+
59
99+
Electron Configuration
[Xe] 4f9 6s2
[Xe] 4f3 6s2
Crystal Structure
Hexagonal Close Packed (HCP)
Hexagonal Close Packed (HCP)
Crystal Lattice
HCP-Crystal-Structure-of-Dysprosium.jpg#100
HCP-Crystal-Structure-of-Praseodymium.jpg#100
Atom
Number of Protons
66
99+
59
99+
Number of Neutrons
96
35
82
99+
Number of Electrons
66
99+
59
99+
Radius of an Atom
Atomic Radius
178.00 pm
16
182.00 pm
11
Covalent Radius
192.00 pm
17
203.00 pm
9
Van der Waals Radius
229.00 pm
20
239.00 pm
14
Atomic Weight
162.50 amu
99+
140.91 amu
99+
Atomic Volume
19.00 cm3/mol
23
20.80 cm3/mol
15
Adjacent Atomic Numbers
Valence Electron Potential
47.40 (-eV)
32
42.64 (-eV)
99+
Lattice Constant
359.30 pm
37
367.25 pm
29
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.57
15
1.61
4
Mechanical Properties
Density
Density At Room Temperature
8.54 g/cm3
99+
6.77 g/cm3
99+
Density When Liquid (at m.p.)
8.37 g/cm3
25
6.50 g/cm3
39
Tensile Strength
120.00 MPa
15
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
24.70 GPa
31
14.80 GPa
39
Bulk Modulus
40.50 GPa
31
28.80 GPa
40
Young's Modulus
61.40 GPa
33
37.30 GPa
99+
Poisson Ratio
0.25
25
0.28
16
Other Mechanical Properties
Sectile
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
8.55
38
6.77
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
926.00 nΩ·m
2
0.70 nΩ·m
99+
Electrical Conductivity
0.01 106/cm Ω
99+
0.01 106/cm Ω
99+
Electron Affinity
50.00 kJ/mol
21
50.00 kJ/mol
21
Thermal Properties
Specific Heat
0.17 J/(kg K)
34
0.19 J/(kg K)
32
Molar Heat Capacity
27.70 J/mol·K
14
27.20 J/mol·K
18
Thermal Conductivity
10.70 W/m·K
99+
12.50 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
9.90 µm/(m·K)
40
6.70 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
230.00 kJ/mol
39
296.80 kJ/mol
29
Enthalpy of Fusion
11.05 kJ/mol
32
6.89 kJ/mol
99+
Enthalpy of Atomization
301.00 kJ/mol
36
368.00 kJ/mol
24
Standard Molar Entropy
75.60 J/mol.K
7
73.20 J/mol.K
10
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