Periodic Table Guide
Lutetium (Lu) has atomic number 71 and is classified as a lanthanide. It sits in Group 3, period 6 of the periodic table. Its practical relevance includes PET detector crystals, catalysts, high-index optics and specialized research 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.
Lutetium 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 Lutetium matters
In engineering and technology, lutetium is associated with PET detector crystals, catalysts, high-index optics and specialized research 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 lutetium depends on concentration and interaction with the other constituents.
Safety and handling
The hazards associated with Lutetium 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
Scandium (Sc) · Yttrium (Y) · Lawrencium (Lr) · Ytterbium (Yb)
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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