Chlorine (Cl) has atomic number 17 and is classified as a halogen. It sits in Group 17, period 3 of the periodic table. Its practical relevance includes water disinfection, PVC production, bleaching, pharmaceuticals and industrial chemical synthesis.
ELEMENT DATA
Quick facts
#Atomic number17
AaSymbolCl Relative
◉Atomic mass35.45 State at room temperature Gas
⌘Group17
Position in the periodic table
Halogens are reactive p-block elements that commonly form -1 ions and many important salts or organic compounds. Their industrial value is substantial, but elemental forms and some compounds can require strict corrosion, toxicity or containment controls.
Chlorine belongs to period 3. Its position helps explain recurring trends such as atomic size, bonding behavior, oxidation states and the way it interacts with neighboring elements.
Why Chlorine matters
In engineering and technology, chlorine is associated with water disinfection, PVC production, bleaching, pharmaceuticals and industrial chemical synthesis. 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 chlorine depends on concentration and interaction with the other constituents.
Safety and handling
The hazards associated with Chlorine 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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