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Bromine

35
Br
79.904
Bromine
 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance

General:

Name: Bromine Symbol: Br
Group: Halogen Atomic weight: 79.904
Density @ 293 K: 3.119 g/cm3 Atomic volume: 23.5 cm3/mol
Group: Halogen discovered: 1826

States:

state (s, l, g): l
melting point: 266 K boiling point: 332.7 K
Heat of fusion: 5.286 kJ/mol Heat of vaporization: 15.438 kJ/mol

Energies:

1st ionization energy: 1139.9 kJ/mole
electronegativity: 2.96 2nd ionization energy: 2103.4 kJ/mole
electron affinity: 324.7 kJ/mole 3rd ionization energy: 3473.4 kJ/mole
Specific heat: 0.473 J/gK heat atomization: 112 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,7 electron configuration: [Ar] 3d10 4s2 4p5
minimum oxidation number: -1 maximum oxidation number: 7
min. common oxidation no.: -1 max. common oxidation no.: 5

Appearance & Characteristics:

structure: layers of Br2 color: red-brown
uses: pesticides,photography toxicity: yes
hardness: mohs characteristics: diatomic,corrosive,liquid

Reactions:

reaction with air: none
reaction with 6M HCl: none, dissolves Br2(aq) reaction with 6M HCl: none, dissolves Br2(aq)
reaction with 15M HNO3: reaction with 6M NaOH: mild, =>OBr-, Br-

Other Forms:

number of isotopes: 2 hydride(s): HBr
oxide(s): Br2O BrO2 chloride(s): BrCl

Radius:

ionic radius (2- ion): pm ionic radius (1- ion): 182 pm
atomic radius: 114 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): pm

Conductivity:

thermal conductivity: 0.12 J/m-sec-deg
electrical conductivity: 0 1/mohm-cm polarizability: 3.1 A^3

Abundance:

source: Seawater, brines
rel. abund. solar system: 1.072 log abundance earth's crust: 0.4 log
cost, pure: 4.9 $/100g cost, bulk: $/100g