Bromine Valence Electrons

01-05-2021 by



Valence electrons are the electrons that are present in the last shell. Bromine belongs to halogen family. All the elements in the group have the same valence electronic configuration that is 7. Valence shell configuration of bromine is 4s 2 4p5. Therefore Bromine has 7 valance electrons. If we look at the electron configuration of the Bromine atom it is represented as; 1s2 2s22p6 3s23p63d104s24p5. In order to obtain a pentavalency, some of the electrons are shifted to 4 view the full answer Previous question Next question. The elements that belong to the same group in the periodic table possess same number of valence electrons. Fluorine, chlorine, bromine and iodine, all belong to the same group, Group 17 of the periodic table. So, all these elements possess same number of valence electrons. Once we know how many valence electrons there are in BrF5 we can distribute them around the central atom with the goal of filling the outer shells of each atom. Note that in the Lewis structure for BrF5, Bromine (B) is in Period Four on the periodic table. This means it can hold more than eight valence electrons. This is called an expanded octet.

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
  • Bromine Page Two
  • 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
Bromine Valence Electrons

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
  • 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

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
  • 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 = 5800Pa@-7.1°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
Bromine number of valence electrons

Who / Where / When / How

Element Bromine Valence Electrons

  • 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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Kenneth Barbalace. Periodic Table of Elements - Bromine - Br. EnvironmentalChemistry.com. 1995 - 2021. Accessed on-line: 4/24/2021
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Valence Electron Br

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Bromine Valence Electrons And Ion

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Bromine Valence Electrons Number

Drawing the Lewis Structure for CBr4 (Carbon Tetachloride)

Viewing Notes:

  • The Lewis structure for CBr4 is similar to CCl4. Since they are in the same Group on the periodic table they each have the same number of electrons (7) their structures are similar.
  • The Carbon atom goes in the center of the Lewis structure since it is the least electronegative.
  • For the CBr4 Lewis structure there are a total of 32 valence electrons available.


See the Big List of Lewis Structures

Transcript: This is the CBr4 Lewis structure: Carbon Tetrabromide. Carbon is in group 4 or 14, so it has 4 valence electrons. Bromine in group 7 or 17, so it has 7, and we have 4 Bromines. So 4 plus 28 equals 32 total valence electrons. Carbon, that's the least electronegative, that'll go in the center; and on the outside we'll put the Bromine atoms. We'll put 2 electrons between atoms to form chemical bonds, and we've used 8.

And then we'll go around the outside and fill the octets for the Bromine until we've used 32 valence electrons. So we have 8, 10, 12, and 32. So we've used all 32 valence electrons. Each of the Bromines has 8 valence electrons, and the central Carbon has 8 valence electrons as well.

So this is the correct structure for CBr4. This is Dr. B.





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