35	Br	Bromine
Atomic Weight: 79.904				Shells: 2,8,18,7
Group: Halogen				Filling orbital: 4p5
Crystal Structure: Orthorhombic				Covalent radius: 1.14 Å
Oxidation States: +1,+5,-1				Atomic radius: 1.12 Å
Electronegativity, Pauling: 2.96				Atomic volume: 23.5 cm³/mol
State at RT: Liquid				First ionization potential: 11.814 V
Melting Point: 265.9°K				2nd ionization potential: 21.8 V
Boiling Point: 331.9°K				3rd ionization potential: 36.0 V
Density @ 293°K: 3.119 g/cm³				Specific heat: 0.473 J/gK
Electrical conductivity: --				Heat of vaporization: 15.438 kJ/mol
Thermal conductivity: 0.00122 W/cmK				Heat of fusion: 5.286 kJ/mol
Element Nuclides
Nuclide		Abundance	Weight	Spin	Half-Life	Decay Modes
Al26		0.%	25.9868	5	7.3E05y	+,
Al27		100.%	26.9815	2.5		Stable
Al28		0.%	28.	3	2.25m	-

Name origin: Greek: brômos (stench).
Description: Red liquid halogen.
Discovered by: Antoine J. Balard
Year: 1826
Location: France
Sources: Occurs in compounds in sea water.
Uses: Produces sever burns and vapor is poisonous.

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Registry Numbers

• CAS: 7726-95-6
• RTECS: EF9100000
• DOT (UN): 1744
• NFPA ratings (1-4)
  • Health: 4

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Description
Heavy, red-brown, fuming liquid with a choking, irritating odor; causes tears

Incompatabilities
combustible organics, oxidizable mater- ial, aqueous ammonia; anhydrous Br2 re- acts with aluminum,titanium, mercury, potassium; wet Br2 reacts with metals

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From DOT Guidebook, Guide Number 59

Fire or Explosion Hazards
Some of these materials may burn but do not ignite readily. Some of these
materials may ignite combustibles (wood, paper, oil, etc.).

Health Hazards
Poison. Poisonous if inhaled or swallowed. Skin contact poisonous. Contact
may cause burns to skin and eyes. Fire may cause irritating or poisonous gases.
Runoff from fire control or dilution water may cause pollution.

Emergency Action: General
Keep unnecessary people away. Stay upwind; keep out of low areas.
Isolate hazard area and deny entry.
Wear positive pressure breathing apparatus and special protective clothing.
Also, in case of water pollution call local authorities.
FOR EMERGENCY ASSISTANCE CALL CHEMTREC (800) 424-9300

Emergency Action: Fire
Some of these materials may react violently with water.
SMALL FIRES: Dry chemical, CO2, water spray or foam.
LARGE FIRES: Water spray, fog or foam.
Move container from fire area if you can do without risk. Cool containers
that are exposed to flames with water from the side until well after fire is out.

Emergency Action: Spill or Leak
Do not touch spilled material. Stop leak if you can do it without risk. Use
water spray to reduce vapors.
SMALL SPILLS: Take up with sand, or other non-combustible absorbent material,
then flush area with water.
LARGE SPILLS: Dike for later disposal and dilute with large amounts of water.

Emergency Action: First Aid
Move victim to fresh air; call emergency medical care. If not breathing give
artificial respiration. If breathing is difficult give oxygen. If case of
contact with material, immediately flush skin or eyes with running water
for at least 15 minutes. Remove and isolate contaminated clothing and
shoes. Keep victim quiet and maintain normal body temperature, observe
victim for delayed effects.

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Material Saftey Data Sheet (MSDS) from OREGON STATE UNIVERSITY

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