| Element (Atom) Name | Thulium |
| Symbol | Tm |
| Physical state at room temperature | Solid |
| Element Classification | Metal |
| Group Name | Lanthanide |
| Period Number (Periodic table) | 6 |
| Group number (Periodic table) | None |
| Atomic number | 69 |
| Atomic weight | 168.93422 (Ref: Jlab-ele069, Nist-69) 168.934218 (Ref: ciaaw-thulium) 168.9 (Ref: Lanl-69) |
| Atomic Radius | 227 pm (Van der Waals) (Ref: Lanl-69) |
| Density | 9.32 g/cm3 (Ref: Jlab-ele069) |
| Melting point | 1545°C (Ref: Jlab-ele069, Lanl-69) |
| Boiling point | 1950°C (Ref: Jlab-ele069, Lanl-69) |
| Electron shell configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f13 5s2 5p6 6s2 |
| Oxidation States | +3 (Ref: Jlab-ele069) 2, 3 (a basic oxide) (Ref: Lanl-69) |
| Ionization Energy | 6.184 eV (Ref: Jlab-ele069) 6.18431 eV (Ref: Nist-69) |
| Number of Stable Isotopes | 1 |
| InChI | InChI=1S/Tm (Ref: Pubchem-69) |
| InChI Key | FRNOGLGSGLTDKL-UHFFFAOYSA-N (Ref: Pubchem-69) |
| Remarks |
REFERENCES
- Jlab-ele069: https://education.jlab.org/itselemental/ele069.html
- Lanl-69: https://periodic.lanl.gov/69.shtml
- ciaaw-thulium: https://www.ciaaw.org/thulium.htm
- Nist-69: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=69
- Pubchem-69: https://pubchem.ncbi.nlm.nih.gov/element/69
- science.co.il: https://www.science.co.il/elements/
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