Element Bromine

Bromine ElementIt is a chemical element with symbol Br and atomic number 35.
Element 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.
Its properties are thus intermediate between those of chlorine and iodine.
Isolated independently by two chemists, Carl Jacob Löwig (in 1825) and Antoine Jérôme Balard (in 1826), its name was derived from the Ancient Greek βρῶμος (“stench”), referencing its sharp and disagreeable smell.

Names and Identifiers

Chemical Formula:Br
CAS:7726-95-6
Molecular Weight:159.808g/mol
EC Number :231-778-1
MDL Number:MFCD00010896
Color:red-brown
Other Names:Brom, Brome, Bromo
PubChem CID:24408
IUPAC Name:Bromine
Inchl:InChI=1S/Br
InChI Key:WKBOTKDWSSQWDR-UHFFFAOYSA-N
Canonical SMILES:[Br]
ICSC Number:0107

Physical & Chemical Properties

Phase:Lquid
Density:3.1028 g/cm³
Boiling Point:332.0 K ​(58.8 °C, ​137.8 °F)
Melting Point:265.8 K ​(−7.2 °C, ​19 °F)
Molecular Formula:Br
Flash Point:113 °C
Exact Mass:157.836655
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H314-H330-H400
Precautionary Statements:P260-P273-P280-P284-P305 + P351 + P338-P310
Hazard Codes:T+,C,N,T
Risk Phrases:R26;R35;R50
Safety Phrases:S26-S45-S61-S7/9-S36/37/39-S28-S53
RIDADR:UN 1744 8/PG 1
WGK Germany:2
RTECS:EF9100000
Packaging Group:I
Hazard Class:8

Both Bromine isotopes are used in nuclear medicine.
Br-81 is used for the production of the radioisotope Kr-81m which is used for diagnostics. Br-79 can be used for the cyclotron production of Kr-77 which decays to the radioisotope Br-77 although the most common production route for Br-77 is via Se-77. Br-77 has been suggested for radiotherapy because of it electron capture decay and ease of labeling.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
79Br78.9183361 (26)50.69 (7)3/22.106399
81Br80.916289 (6)49.31 (7)3/22.270560

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
72Br71.93651.31 mEC to 72Se3
73Br72.93183.4 mEC to 73Se3/2
74Br73.9298925.4 mEC to 74Se
75Br74.925781.62 hEC to 75Se3/20.75
76Br75.9245416.0 hEC to 76Se10.54821
77Br76.9213802.376 dEC to 77Se3/2
78Br77.9211466.46 mEC to 78Se; β to 78Kr10.1
80Br79.91853017.66 mEC to 80Se; β to 80Kr10.5140
82Br81.9168051.471 dβ to 82Kr51.6270
83Br82.9151812.40 hβ to 83Kr3/2
84Br83.9165131.8 mβ to 84Kr2
85Br84.915612.87 mβ to 85Kr3/2

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