Bromine is a chemical element with symbol Br and atomic number 35, placing it between chlorine and iodine in group 17 of the periodic table. Its properties make it valuable for flame retardants, water treatment, and specialized industrial chemistry.
Below is a structured overview of key identifiers, material forms, common applications, and safety considerations for compounds containing bromine. The table focuses on attributes relevant to handling, regulatory status, and typical use cases.
| Attribute | Details | Relevance | Notes |
|---|---|---|---|
| Atomic number | 35 | Identification | Defines proton count and element identity |
| Common oxidation states | -1, +1, +3, +5, +7 | Chemistry behavior | Variability enables diverse bromine compounds |
| Physical state at 20°C | Red-brown liquid | Handling considerations | Volatile and corrosive, requires careful storage |
| Key industrial uses | Flame retardants, disinfectants, drilling fluids | Applications | Selected for reactivity and compound stability |
| Regulatory status | REACH, TSCA listed, usage restrictions | Compliance | Material safety data and reporting obligations apply |
Atomic Number and Periodic Classification
The atomic number of bromine is 35, which determines its position in period 4 and group 17. This placement influences electron configuration, resulting in strong electronegativity and a pronounced tendency to form anions or covalent bonds.
Within the halogen series, bromine exhibits intermediate reactivity between chlorine and iodine. Its valence electron arrangement supports diverse redox behavior, enabling roles in organic synthesis and purification processes.
Material Forms and Handling
Elemental bromine specifications
Elemental bromine is typically supplied as a dense liquid with a pungent odor. Standard packaging includes corrosion-resistant containers designed to minimize vapor release and prevent environmental exposure.
Aqueous solutions and compounds
Commercial bromine solutions and bromide salts are common in industrial settings. Compatibility testing with metals and organic materials is essential to avoid hazardous reactions and container degradation.
Environmental and Safety Considerations
Bromine and many brominated compounds pose health risks upon inhalation or skin contact, requiring engineering controls and personal protective equipment. Ventilation, leak detection, and proper labeling are fundamental safety measures.
Environmental regulations focus on limiting releases due to toxicity and potential ozone depletion. Waste treatment methods are designed to neutralize bromine species before discharge to protect ecosystems.
Industrial Applications and Performance
In flame retardancy, brominated compounds interrupt combustion processes, enhancing safety in electronics and construction materials. Formulators balance efficacy with regulatory limits and environmental persistence.
Water treatment applications leverage bromine’s disinfecting power to control biofouling and pathogens. Process conditions such as pH and temperature influence efficacy and byproduct profiles, necessitating monitored dosing protocols.
Operational Guidance and Best Practices
- Verify material compatibility before storing bromine in metal or polymer containers.
- Implement routine monitoring of air quality and potential bromine vapor leaks.
- Follow regulatory limits for emissions and waste disposal to protect personnel and environment.
- Document handling procedures and provide appropriate training for all personnel working with bromine.
FAQ
Reader questions
What does the atomic number 35 indicate about bromine’s electron configuration?
Atomic number 35 means bromine has 35 protons and, in a neutral atom, 35 electrons. Its electron configuration ends in 4s² 3d¹⁰ 4p⁵, defining its chemical behavior as a reactive halogen.
Why is bromine stored and transported as a liquid?
Bromine is a liquid at ambient temperature due to its relatively low boiling point near 59°C. Its density and volatility allow efficient handling in sealed, corrosion-resistant containers that minimize vapor release.
How does the atomic number of bromine relate to its position in the periodic table?
The atomic number 35 places bromine in period 4, group 17, directly below chlorine and above iodine. This position reflects trends in atomic radius, electronegativity, and typical oxidation states within the halogen group.
What are common industrial uses that depend on bromine’s properties?
Bromine is used in flame retardants, water treatment, drilling fluids, and as a reagent in organic synthesis. These applications exploit its reactivity, biocidal activity, and ability to form stable compounds with tailored performance.