Palladium Holmium Comparison
Periodic Table
Symbol
Pd
Ho
Group Number
10
8
Not Available
Period Number
5
6
Block
d block
f block
Element Family
Transition Metal
Lanthanide
CAS Number
7440053
99+
7440600
29
Space Group Name
Fm_ 3m
P63/mmc
Space Group Number
225.00
2
194.00
5
Facts
Interesting Facts
- Palladium alloys are used for Jewelry contains (95% Palladium and 5% Ruthenium)
- In the late 1800s, Palladium metal used have more economical value than the Platinum metal.
- Palladium element is known as a good catalyst
- Holmium metal is very soft and malleable.
- Holmium metal is well known for its corrosion resistivity.
Sources
Ores of metals
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
William Hyde Wollaston
Marc Delafontaine
Discovery
In 1803
In 1878
Abundance
Abundance In Universe
2 * 10-7 %
22
5 * 10-8 %
27
Abundance In Sun
~0.0000003 %
24
~-9999 %
Abundance In Meteorites
0.00 %
99+
0.00 %
99+
Abundance In Earth's Crust
0.00 %
99+
0.00 %
38
Abundance In Oceans
Not Available
0.00 %
99+
Uses
Uses & Benefits
- Mostly palladium metal is used in catalytic converters. In electronic industry it is used in ceramic capacitors of mobile and computer.
- It is used in jewellery and dental fillings and crowns.
- Holmium metal has an ability to absorb neutrons, so this metal is used in nuclear reactors to keep the chain reactions of elements under control.
- Alloys of Holmium are used to produce Magnet.
Industrial Uses
Aerospace Industry, Automobile Industry, Electronic Industry
NA
Medical Uses
Dentistry, Pharmaceutical Industry, Surgical Instruments Manufacturing
NA
Other Uses
Coinage, Bullion, Jewellery
Alloys, Nuclear Research
Biological Properties
Toxicity
Toxic
Low Toxic
Present in Human Body
No
No
Physical Properties
Melting Point
1,554.90 °C
22
1,461.00 °C
30
Boiling Point
2,963.00 °C
33
2,600.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silver
Silvery White
Luster
Metallic
Metallic
Hardness
Mohs Hardness
4.75
9
Not Available
Brinell Hardness
320.00 MPa
33
746.00 MPa
13
Vickers Hardness
121.00 MPa
36
481.00 MPa
23
Speed of Sound
3,070.00 m/s
26
2,760.00 m/s
30
Optical Properties
Refractive Index
1.72
1
Not Available
Reflectivity
84.00 %
4
Not Available
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
Pd
Ho
Isotopes
Known Isotopes
38
1
34
5
Electronegativity
Pauling Electronegativity
2.20
4
1.23
37
Allred Rochow Electronegativity
1.35
21
1.10
30
Allen Electronegativity
1.59
22
Not Available
Electropositivity
Pauling Electropositivity
1.80
99+
2.77
17
Ionization Energies
1st Energy Level
520.23 kJ/mol
99+
581.00 kJ/mol
99+
2nd Energy Level
7,298.22 kJ/mol
2
1,140.00 kJ/mol
99+
3rd Energy Level
11,815.13 kJ/mol
3
2,204.00 kJ/mol
99+
4th Energy Level
Not Available
4,100.00 kJ/mol
34
Electrochemical Equivalent
1.99 g/amp-hr
30
2.02 g/amp-hr
29
Electron Work Function
5.12 eV
3
Not Available
Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Solubility
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
46
99+
67
99+
Electron Configuration
[Kr] 4d10
[Xe] 4f11 6s2
Crystal Structure
Face Centered Cubic (FCC)
Hexagonal Close Packed (HCP)
Crystal Lattice
FCC-Crystal-Structure-of-Palladium.jpg#100
HCP-Crystal-Structure-of-Holmium.jpg#100
Atom
Number of Protons
46
99+
67
99+
Number of Neutrons
60
99+
98
34
Number of Electrons
46
99+
67
99+
Radius of an Atom
Atomic Radius
137.00 pm
40
176.00 pm
18
Covalent Radius
139.00 pm
99+
192.00 pm
17
Van der Waals Radius
163.00 pm
40
216.00 pm
24
Atomic Weight
106.42 amu
99+
164.93 amu
99+
Atomic Volume
8.90 cm3/mol
99+
18.70 cm3/mol
24
Adjacent Atomic Numbers
Valence Electron Potential
33.00 (-eV)
99+
47.90 (-eV)
31
Lattice Constant
389.07 pm
25
357.73 pm
38
Lattice Angles
π/2, π/2, π/2
π/2, π/2, 2 π/3
Lattice C/A Ratio
Not Available
1.57
17
Mechanical Properties
Density
Density At Room Temperature
12.02 g/cm3
29
8.79 g/cm3
99+
Density When Liquid (at m.p.)
10.38 g/cm3
17
8.34 g/cm3
26
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
27
0.00 (Pa)
16
Vapor Pressure at 2000 K
0.00 (Pa)
30
Not Available
Elasticity properties
Shear Modulus
44.00 GPa
17
26.30 GPa
28
Bulk Modulus
180.00 GPa
9
40.20 GPa
32
Young's Modulus
121.00 GPa
16
64.80 GPa
31
Poisson Ratio
0.39
5
0.23
29
Other Mechanical Properties
Ductile, Malleable, Weldable
Ductile, Malleable, Sectile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
12.02
21
8.80
35
Magnetic Ordering
Diamagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
105.40 nΩ·m
29
814.00 nΩ·m
4
Electrical Conductivity
0.10 106/cm Ω
22
0.01 106/cm Ω
99+
Electron Affinity
54.23 kJ/mol
17
50.00 kJ/mol
21
Thermal Properties
Specific Heat
0.24 J/(kg K)
23
0.16 J/(kg K)
35
Molar Heat Capacity
25.98 J/mol·K
33
27.15 J/mol·K
19
Thermal Conductivity
71.80 W/m·K
23
16.20 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
11.80 µm/(m·K)
33
11.20 µm/(m·K)
35
Enthalpy
Enthalpy of Vaporization
376.60 kJ/mol
19
241.00 kJ/mol
38
Enthalpy of Fusion
16.74 kJ/mol
18
11.76 kJ/mol
29
Enthalpy of Atomization
393.30 kJ/mol
22
301.00 kJ/mol
36
Standard Molar Entropy
37.60 J/mol.K
40
75.30 J/mol.K
8
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