Cesium (Cs) has atomic number 55 and is classified as a alkali metal. It sits in Group 1, period 6 of the periodic table. Its practical relevance includes atomic clocks, drilling fluids, photoelectric devices, research and specialty catalysts.
ELEMENT DATA
Quick facts
#Atomic number55
AaSymbolCs Relative
◉Atomic mass132.90545 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.
Cesium 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 Cesium matters
In engineering and technology, cesium is associated with atomic clocks, drilling fluids, photoelectric devices, research and specialty catalysts. 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 cesium depends on concentration and interaction with the other constituents.
Safety and handling
The hazards associated with Cesium 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.
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