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Bromine |
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Pronunciation | (BROH-meen, -min) |
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Appearance | gas/liquid: red-brown solid: metallic luster |
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Standard atomic weight Ar, std(Br) | [7001799010000000000♠79.901, 7001799070000000000♠79.907] conventional: 7001799040000000000♠79.904 |
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Mass number | Br: |
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Bromine in the periodic cairt |
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Atomic nummer (Z) | 35 |
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Group | group 17 (halogens) |
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Period | period 4 |
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Block | p-block |
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Element category | Reactive nonmetal |
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Electron confeeguration | [Ar] 3d10 4s2 4p5 |
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Electrons per shell | 2, 8, 18, 7 |
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Pheesical properties |
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Phase at STP | liquid |
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Meltin pynt | 265.8 K (-7.2 °C, 19 °F) |
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Bylin pynt | 332.0 K (58.8 °C, 137.8 °F) |
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Density (near r.t.) | (Br2, liquid) 3.1028 g/cm3 |
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Treeple pynt | 265.90 K, 5.8[1] kPa |
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Creetical pynt | 588 K, 10.34[1] MPa |
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Heat o fusion | (Br2) 10.571 kJ/mol |
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Heat o vapourisation | (Br2) 29.96 kJ/mol |
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Molar heat capacity | (Br2) 75.69 J/(mol·K) |
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Vapour pressur
P (Pa)
|
1
|
10
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100
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1 k
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10 k
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100 k
|
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at T (K)
|
185
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201
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220
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244
|
276
|
332
|
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Atomic properties |
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Oxidation states | −1, +1, +3, +4, +5, +7 strangly acidic |
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Electronegativity | Pauling scale: 2.96 |
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Atomic radius | empirical: 120 pm |
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Covalent radius | 120±3 pm |
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Van der Waals radius | 185 pm |
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Spectral lines o bromine |
Ither properties |
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Naitural occurrence | Br: Primordial |
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Creestal structur | orthorhombic |
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Speed o soond | (20°C) 206 m/s |
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Thermal conductivity | 0.122 W/(m·K) |
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Electrical resistivity | 7.8×1010 Ω·m (at 20 °C) |
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Magnetic orderin | diamagnetic[2] |
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CAS Nummer | 7726-95-6 |
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History |
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Diskivery | Antoine Jérôme Balard an Leopold Gmelin (1825) |
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First isolation | Antoine Jérôme Balard an Leopold Gmelin (1825) |
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Main isotopes o bromine |
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| references |