Symbol
Tm
  
Pd
  
Group Number
Not Available
  
Period Number
6
  
5
  
Block
f block
  
d block
  
Element Family
Lanthanide
  
Transition Metal
  
Space Group Name
P63/mmc
  
Fm_ 3m
  
Interesting Facts
- Thulium metal can resist corrosion due to dry air .
- Only Tm-169 isotope of Thulium metal occur naturally.
  
- 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
  
Sources
Found in Minerals, Mining, Ores of Minerals
  
Ores of metals
  
History
  
  
Who Discovered
Per Teodor Cleve
  
William Hyde Wollaston
  
Discovery
In 1879
  
In 1803
  
Abundance
  
  
Abundance In Sun
~0.00000002 %
  
28
~0.0000003 %
  
24
Abundance In Earth's Crust
Abundance In Oceans
Not Available
  
Uses & Benefits
- Thulium metal produces isotopes that emits X-rays. This isotope is used in X-ray machine.
-
Thulium element is also used in Surgical equipment like laser.
  
- 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.
  
Industrial Uses
NA
  
Aerospace Industry, Automobile Industry, Electronic Industry
  
Medical Uses
NA
  
Dentistry, Pharmaceutical Industry, Surgical Instruments Manufacturing
  
Other Uses
Alloys, Nuclear Research, Research Purposes
  
Coinage, Bullion, Jewellery
  
Biological Properties
  
  
Toxicity
Unknown
  
Toxic
  
Present in Human Body
No
  
No
  
Melting Point
1,545.00 °C
  
23
1,554.90 °C
  
22
Boiling Point
1,730.00 °C
  
99+
2,963.00 °C
  
33
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery Gray
  
Silver
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Mohs Hardness
Not Available
  
Speed of Sound
Not Available
  
3,070.00 m/s
  
26
Optical Properties
  
  
Refractive Index
Not Available
  
Reflectivity
Not Available
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Tm
  
Pd
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Allred Rochow Electronegativity
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
596.70 kJ/mol
  
99+
520.23 kJ/mol
  
99+
2nd Energy Level
1,160.00 kJ/mol
  
99+
7,298.22 kJ/mol
  
2
3rd Energy Level
2,285.00 kJ/mol
  
99+
11,815.13 kJ/mol
  
3
4th Energy Level
4,120.00 kJ/mol
  
33
Not Available
  
Electrochemical Equivalent
2.10 g/amp-hr
  
26
1.99 g/amp-hr
  
30
Electron Work Function
Not Available
  
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
  
Chemical Stability, Corrosion, Ionization, Solubility
  
Electron Configuration
[Xe] 4f13 6s2
  
[Kr] 4d10
  
Crystal Structure
Hexagonal Close Packed (HCP)
  
Face Centered Cubic (FCC)
  
Crystal Lattice
HCP-Crystal-Structure-of-Thulium.jpg#100
  
FCC-Crystal-Structure-of-Palladium.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Van der Waals Radius
Not Available
  
Atomic Weight
168.93 amu
  
99+
106.42 amu
  
99+
Atomic Volume
18.10 cm3/mol
  
28
8.90 cm3/mol
  
99+
Adjacent Atomic Numbers
  
  
Valence Electron Potential
49.70 (-eV)
  
28
33.00 (-eV)
  
99+
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Density
  
  
Density At Room Temperature
12.02 g/cm3
  
29
Density When Liquid (at m.p.)
10.38 g/cm3
  
17
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Ductile, Malleable
  
Ductile, Malleable, Weldable
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Diamagnetic
  
Electrical Properties
  
  
Electrical Property
Conductor
  
Conductor
  
Resistivity
105.40 nΩ·m
  
29
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.10 106/cm Ω
  
22
Electron Affinity
50.00 kJ/mol
  
21
54.23 kJ/mol
  
17
Specific Heat
0.16 J/(kg K)
  
35
0.24 J/(kg K)
  
23
Molar Heat Capacity
27.03 J/mol·K
  
22
25.98 J/mol·K
  
33
Thermal Conductivity
16.90 W/m·K
  
99+
71.80 W/m·K
  
23
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
13.30 µm/(m·K)
  
29
11.80 µm/(m·K)
  
33
Enthalpy
  
  
Enthalpy of Vaporization
191.00 kJ/mol
  
99+
376.60 kJ/mol
  
19
Enthalpy of Fusion
16.80 kJ/mol
  
17
16.74 kJ/mol
  
18
Enthalpy of Atomization
247.00 kJ/mol
  
99+
393.30 kJ/mol
  
22
Standard Molar Entropy
74.00 J/mol.K
  
9
37.60 J/mol.K
  
40