Actinium (Ac) has atomic number 89 and is classified as a actinide. It sits in f-block series, period 7 of the periodic table. Its practical relevance includes targeted alpha-therapy research, neutron sources and nuclear science.
ELEMENT DATA
Quick facts
#Atomic number89
AaSymbolAc Relative
◉Atomic mass[227] State at room temperature Solid
⌘Groupf-block
Position in the periodic table
Actinides are radioactive f-block metals. Their importance is concentrated in nuclear energy, isotope technology and fundamental research, with radiological protection and material containment central to their handling.
Actinium belongs to period 7. Its position helps explain recurring trends such as atomic size, bonding behavior, oxidation states and the way it interacts with neighboring elements.
Why Actinium matters
In engineering and technology, actinium is associated with targeted alpha-therapy research, neutron sources and nuclear science. 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 actinium depends on concentration and interaction with the other constituents.
Safety and handling
Actinium is radioactive, so any practical work involving it requires specialist radiological controls, approved facilities and isotope-specific procedures.
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