Home

What is Thulium?

Thulium In Periodic Table

Thulium Symbol
Tm

Group Number
Not Available

Period Number
6
📊

Block
f block
📊

Element Family
Lanthanide
📊

CAS Number of Thulium
7440304
51

Space Group Name
P63/mmc

Space Group Number
194.00
5
📊

Facts about Thulium

Interesting Facts
  • Thulium metal can resist corrosion due to dry air .
  • Only Tm-169 isotope of Thulium metal occur naturally.

Sources
Found in Minerals, Mining, Ores of Minerals

History of Thulium

Who Discovered
Per Teodor Cleve

Discovery
In 1879

Abundance of Thulium

Abundance In Universe
0.00 %
30
📊

Abundance In Sun
0.00 %
29
📊

Abundance In Meteorites
0.00 %
47
📊

Abundance In Earth's Crust
0.00 %
43
📊

Abundance In Oceans
0.00 %
41
📊

Abundance In Humans
Not Available

Uses of Thulium

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.

Industrial Uses
NA

Medical Uses
NA

Other Uses
Alloys, Nuclear Research, Research Purposes

Biological Properties

Toxicity
Unknown

Present in Human Body
📊

In Blood
Not Available

In Bone
Not Available

Physical Properties of Thulium

Thulium Melting Point
1,545.00 °C
23
📊

Thulium Boiling Point
1,730.00 °C
55
📊

Appearance of Thulium

Physical State
Solid
📊

Color
Silvery Gray

Luster
Metallic
📊

Hardness of Thulium

Mohs Hardness
Not Available

Brinell Hardness
471.00 MPa
25
📊

Vickers Hardness
520.00 MPa
21
📊

Speed of Sound
Not Available

Optical Properties

Refractive Index
Not Available

Reflectivity
Not Available

Allotropes

α Allotropes
Not Available

β Allotropes
Not Available

γ Allotropes
Not Available

Chemical Properties of Thulium

Chemical Formula
Tm

Isotopes of Thulium

Known Isotopes
32
7
📊

Electronegativity

Pauling Electronegativity
1.25
35
📊

Sanderson Electronegativity
Not Available

Allred Rochow Electronegativity
1.11
29
📊

Mulliken-Jaffe Electronegativity
Not Available

Allen Electronegativity
Not Available

Electropositivity

Pauling Electropositivity
2.75
19
📊

Ionization Energies

1st Energy Level
596.70 kJ/mol
55
📊

2nd Energy Level
1,160.00 kJ/mol
66
📊

3rd Energy Level
2,285.00 kJ/mol
57
📊

4th Energy Level
4,120.00 kJ/mol
33
📊

5th Energy Level
Not Available

6th Energy Level
Not Available

7th Energy level
Not Available

8th Energy Level
Not Available

9th Energy Level
Not Available

10th Energy Level
Not Available

11th Energy Level
Not Available

12th Energy Level
Not Available

13th Energy Level
Not Available

14th Energy Level
Not Available

15th Energy Level
Not Available

16th Energy Level
Not Available

17th Energy Level
Not Available

18th Energy Level
Not Available

19th Energy Level
Not Available

20th Energy Level
Not Available

21st Energy Level
Not Available

22nd Energy Level
Not Available

23rd Energy Level
Not Available

24th Energy Level
Not Available

25th Energy Level
Not Available

26th Energy Level
Not Available

27th Energy Level
Not Available

28th Energy Level
Not Available

29th Energy Level
Not Available

30th Energy Level
Not Available

Electrochemical Equivalent
2.10 g/amp-hr
26
📊

Electron Work Function
Not Available

Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility

Atomic Properties of Thulium

Atomic Number of Thulium
69
47
📊

Thulium Electron Configuration
[Xe] 4f13 6s2

Crystal Structure
Hexagonal Close Packed (HCP)
📊

Crystal Lattice
HCP-Crystal-Structure-of-Thulium.jpg#100

Atom of Thulium

Number of Protons
69
46
📊

Number of Neutrons
100
33
📊

Number of Electrons
69
46
📊

Radius of an Atom

Atomic Radius
176.00 pm
18
📊

Covalent Radius
160.00 pm
30
📊

Van der Waals Radius
Not Available

Atomic Weight
168.93 amu
42
📊

Atomic Volume
18.10 cm3/mol
28
📊

Adjacent Atomic Numbers

Previous Element

Next Element

Valence Electron Potential
49.70 (-eV)
28
📊

Lattice Constant
353.75 pm
40
📊

Lattice Angles
π/2, π/2, 2 π/3

Lattice C/A Ratio
1.57
17
📊

Mechanical Properties of Thulium

Thulium Density

Density At Room Temperature
9.32 g/cm3
40
📊

Density When Liquid (at m.p.)
8.56 g/cm3
24
📊

Tensile Strength
Not Available

Viscosity
Not Available

Vapor Pressure of Thulium

Vapor Pressure at 1000 K
0.06 (Pa)
10
📊

Vapor Pressure at 2000 K
Not Available

Elasticity properties

Shear Modulus
30.50 GPa
22
📊

Bulk Modulus
44.50 GPa
26
📊

Young's Modulus
74.00 GPa
27
📊

Poisson Ratio
0.21
31
📊

Other Mechanical Properties
Ductile, Malleable

Magnetic Properties of Thulium

Magnetic Characteristics of Thulium

Specific Gravity
9.32
31
📊

Magnetic Ordering
Paramagnetic
📊

Permeability
Not Available

Susceptibility
Not Available

Electrical Properties

Electrical Property
Conductor
📊

Resistivity
676.00 nΩ·m
5
📊

Electrical Conductivity
0.02 106/cm Ω
49
📊

Electron Affinity
50.00 kJ/mol
21
📊

Thermal Properties of Thulium

Specific Heat
0.16 J/(kg K)
35
📊

Molar Heat Capacity
27.03 J/mol·K
22
📊

Thermal Conductivity
16.90 W/m·K
49
📊

Critical Temperature
Not Available

Thermal Expansion
13.30 µm/(m·K)
29
📊

Enthalpy of Thulium

Enthalpy of Vaporization
191.00 kJ/mol
42
📊

Enthalpy of Fusion
16.80 kJ/mol
17
📊

Enthalpy of Atomization
247.00 kJ/mol
41
📊

Standard Molar Entropy
74.00 J/mol.K
9
📊