Francium (Fr) has atomic number 87 and is classified as a alkali metal. It sits in Group 1, period 7 of the periodic table. Its practical relevance includes fundamental atomic and nuclear research because only minute short-lived quantities exist.
ELEMENT DATA
Quick facts
#Atomic number87
AaSymbolFr Relative
◉Atomic mass[223] State at room temperature Solid
⌘Group1
Position in the periodic table
Alkali metals are highly reactive s-block metals with one valence electron. Their chemistry is dominated by +1 oxidation states, and they require careful handling because several react vigorously with air or water.
Francium 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 Francium matters
In engineering and technology, francium is associated with fundamental atomic and nuclear research because only minute short-lived quantities exist. 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 francium depends on concentration and interaction with the other constituents.
Safety and handling
Francium is radioactive, so any practical work involving it requires specialist radiological controls, approved facilities and isotope-specific procedures.
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