Atomic Mass of Bromine Atomic mass of Bromine is 79.904 u. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. The chemical symbol for Bromine is Br. Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Bromine has two naturally occurring isotopes, Br-79 and Br-81. The mass of Br-79 is 78.92 amu with a percent abundance of 50.69%. If the atomic mass of bromine is 79.904 amu, calculate the mass.
Element Bromine - Br
Comprehensive data on the chemical element Bromine is provided on this page; including scores of properties, element names in many languages, most known nuclides of Bromine. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.
Bromine Menu
- Bromine Page One
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- Bromine Page Three
Overview of Bromine
- Atomic Number: 35
- Group: 17
- Period: 4
- Series: Halogens
Bromine's Name in Other Languages
- Latin: Bromum
- Czech: Brom
- Croatian: Brom
- French: Brome
- German: Brom - r
- Italian: Bromo
- Norwegian: Brom
- Portuguese: Bromo
- Russian: Бром
- Spanish: Bromo
- Swedish: Brom
Atomic Structure of Bromine
- Atomic Radius: 1.12Å
- Atomic Volume: 23.5cm3/mol
- Covalent Radius: 1.14Å
- Cross Section (Thermal Neutron Capture)σa/barns: 6.8
- Crystal Structure: Orthorhombic
- Electron Configuration:
- 1s2 2s2p6 3s2p6d10 4s2p5
- Electrons per Energy Level: 2,8,18,7
- Shell Model
- Shell Model
- Ionic Radius: 1.96Å
- Filling Orbital: 4p5
- Number of Electrons (with no charge): 35
- Number of Neutrons (most common/stable nuclide): 45
- Number of Protons: 35
- Oxidation States:±1,5
- Valence Electrons: 4s2p5
- Electron Dot Model
- Electron Dot Model
Chemical Properties of Bromine
- Electrochemical Equivalent: 2.9812g/amp-hr
- Electron Work Function:
- Electronegativity: 2.96 (Pauling); 2.74 (Allrod Rochow)
- Heat of Fusion: 5.286kJ/mol
- Incompatibilities:
- combustible organics (sawdust, wood, cotton, straw, etc.), oxidizable material, aqueous ammonia, hydrogen, acetylene, phosphorus, aluminum, titanium, mercury, potassium, other metals.
- Ionization Potential
- First: 11.814
- Second: 21.8
- Third: 36
- Valence Electron Potential (-eV): -7.35
Physical Properties of Bromine
- Atomic Mass Average: 79.904
- Boiling Point: 332.4K 59.25°C 138.65°F
- Coefficient of lineal thermal expansion/K-1: N/A
- Conductivity
- Electrical:
Thermal: 0.00122 W/cmK
- Electrical:
- Density: 3.119g/cc @ 300K
- Description:
- Heavy, red-brown, fuming liquid with a choking, irritating odor; causes tears
- Elastic Modulus:
- Bulk: 1.9/GPa
- Enthalpy of Atomization: 111.7 kJ/mole @ 25°C
- Enthalpy of Fusion: 5.29 kJ/mole
- Enthalpy of Vaporization: 15.46 kJ/mole
- Flammablity Class: Noncombustible Liquid
- Freezing Point:see melting point
- Heat of Vaporization: 15.438kJ/mol
- Melting Point: 266.05K -7.1°C 19.2°F
- Molar Volume: 25.62 cm3/mole
- Optical Refractive Index: 1.001132
- Physical State (at 20°C & 1atm): Liquid
- Realitive Gas Density (Air=1) = 5.51
- Specific Heat: 0.473J/gK
- Vapor Pressure = [email protected]°C
Regulatory / Health
- CAS Number
- 7726-95-6
- UN/NA ID and ERG Guide Number
- 1744 / 154
- RTECS: EF9100000
- NFPA 704
- Health: 4
- Fire:
- Reactivity:
- Special Hazard:
- OSHAPermissible Exposure Limit (PEL)
- 1 ppm = 6.54mg/m3 @ 25°C & 1 atm
- TWA: 0.1 ppm
- OSHA PEL Vacated 1989
- TWA: 0.1 ppm
- STEL: 0.3 ppm
- NIOSHRecommended Exposure Limit (REL)
- TWA: 0.1 ppm
- STEL: 0.3 ppm
- IDLH: 3 ppm
- Routes of Exposure: Inhalation; Ingestion; Skin and/or eye contact
- Target Organs: Respiratory system, eyes, central nervous system, skin
- Levels In Humans:
Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.- Blood/mg dm-3: 4.7
- Bone/p.p.m: 6.7
- Liver/p.p.m: 0.2-7
- Muscle/p.p.m: 7.7
- Daily Dietary Intake: 0.8-24 mg
- Total Mass In Avg. 70kg human: 260 mg
Who / Where / When / How
- Discoverer: Antoine J. Balard/ C. Löwig
- Discovery Location: Montpellier France/Heidelberg Germany
- Discovery Year: 1826
- Name Origin:
- Greek: brômos (stench).
- Abundance of Bromine:
- Earth's Crust/p.p.m.: 0.37
- Seawater/p.p.m.: 65
- Atmosphere/p.p.m.: N/A
- Sun (Relative to H=1E12): N/A
- Sources of Bromine:
- Occurs in compounds in sea water, Dead Sea, natural brines and salt-lake evaporates. World wide production estimated to be around 330,000 tons per year. Main mining areas are USA, Israel, UK, Russia, France and Japan.
- Uses of Bromine:
- Used for water purification (swimming pools), manufacture of ethylene dibromide (anti-knocking gasoline), bleaching, organic synthesis, solvent, analytical reagent, fire retardant for plastics, pharmaceuticals, shrink-proofing wool.
- Additional Notes:
Bromine Menu
- Bromine Page One
- Bromine Page Two
- Bromine Page Three
References
A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.
Related Resources
- Anatomy of the Atom
Answers many questions regarding the structure of atoms. - Molarity, Molality and Normality
Introduces stoichiometry and explains the differences between molarity, molality and normality. - Molar Mass Calculations and Javascript Calculator
Molar mass calculations are explained and there is a JavaScript calculator to aid calculations. - Chemical Database
This database focuses on the most common chemical compounds used in the home and industry.
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