Periodic Table Guide
Thulium (Tm) has atomic number 69 and is classified as a lanthanide. It sits in f-block series, period 6 of the periodic table. Its practical relevance includes lasers, portable X-ray sources, research and specialty ceramic materials.
Quick facts
Position in the periodic table
Lanthanides are f-block metals known for closely related chemistry and valuable magnetic, optical and catalytic properties. They are important in permanent magnets, phosphors, lasers, catalysts and advanced electronic systems.
Thulium belongs to period 6. Its position helps explain recurring trends such as atomic size, bonding behavior, oxidation states and the way it interacts with neighboring elements.
Why Thulium matters
In engineering and technology, thulium is associated with lasers, portable X-ray sources, research and specialty ceramic materials. The importance of the element may come from the pure element itself, from compounds containing it, or from its role as an alloying, electronic, catalytic or nuclear material.
Engineering and scientific context
Material behavior should never be inferred from the element name alone. Purity, isotope composition, crystal structure, processing history, temperature and the surrounding chemical environment can all change performance. In alloys and compounds, the contribution of thulium depends on concentration and interaction with the other constituents.
Safety and handling
The hazards associated with Thulium depend on its physical form, purity, compounds, process temperature and exposure route. Engineering decisions should use the applicable safety data sheet and project-specific risk assessment.
Related elements
Reference sources
For authoritative element data and current standard atomic-weight guidance, consult the Royal Society of Chemistry Periodic Table and the IUPAC Periodic Table of the Elements.
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