69
Tm
Thulium
Thulium
Thulium (Tm)
Lanthanides · Solid · Period 6 · Group 3
Element Properties
- Atomic Number
- 69
- Symbol
- Tm
- Atomic Mass
- 168.9342
- Category
- Lanthanides
- Standard State
- Solid
- Period
- 6
- Group
- 3
- Electronegativity
- 1.25
- Atomic Radius
- 227
- Ionization Energy
- 6.18
- Electron Affinity
- —
- Oxidation States
- +3
- Melting Point
- 1818 K (1544.85 °C)
- Boiling Point
- 2223 K (1949.85 °C)
- Density
- 9.32
- Electron Configuration
- [Xe]6s2 4f13
- Year Discovered
- 1879
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Frequently asked questions
What is the atomic number of Thulium?
The atomic number of Thulium is 69, which equals the number of protons in its nucleus.
What is the atomic mass of Thulium?
The atomic mass of Thulium is approximately 168.9342 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Thulium?
The electron configuration of Thulium is [Xe]6s2 4f13.
Where is Thulium in the periodic table?
Thulium is located in period 6, group 3.
When was Thulium discovered?
Thulium was discovered in 1879.
Related elements
Same group
21
Sc
Scandium
44.956
39
Y
Yttrium
88.906
57
La
Lanthanum
138.905
58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.908
60
Nd
Neodymium
144.24