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Bròm - Wikipèdia

Bròm

Un article de Wikipèdia, l'enciclopèdia liura.

35 selènibròmcripton
Cl

Br

I
Taula periodica
Generalitats
Nom, Simbòl, Numero bròm, Br, 35
Tièra quimica alogèns
Grop, Periòde, Blòc 17, 4, p
Aparéncia gas/liquid: red-brown
solid: metallic luster
Massa atomica 79.904(1) g/mol
Configuracion electronica [Ar] 3d10 4s2 4p5
Electrons per nivèl energetic 2, 8, 18, 7
Proprietats fisicas
Fasa liquid
Densitat (temperatura ambienta) (liquid) 3.1028 g/cm³
Punt de fusion 265.8 K
(-7.3 °C, 19 °F)
Punt d'ebullicion 332.0 K
(58.8 °C, 137.8 °F)
Calor de fusion (Br2) 10.57 kJ/mol
Calor de vaporizacion (Br2) 29.96 kJ/mol
Capacitat calorifica (25 °C) (Br2)
75.69 J/(mol·K)
Pression de vapor
P/Pa 1 10 100 1 k 10 k 100 k
a T/K 185 201 220 244 276 332
Proprietats atomicas
Estructura cristallina ortorombic
Estat d'oxidacion ±1, 5
(oxid fòrtament acid)
Electronegativitat 2.96 (Escala de Pauling)
Potencials d'ionizacion
(mai)
1èr : 1139.9 kJ/mol
2nd : 2103 kJ/mol
3en : 3470 kJ/mol
Rai atomic 115 pm
Rai atomic calculat 94 pm
Rai covalent 114 pm
Rai de Van der Waals 185 pm
Informacions divèrsas
Magnetisme nonmagnetic
Resistivitat electrica (20 °C) 7.8×1010 Ω·m
Conductivitat termica (300 K) 0.122 W/(m·K)
Velocitat del son (20 °C) ? 206 m/s
Numèro CAS 7726-95-6
Isotòps mai estables
Article : Isotòps del (de l') bròm
iso NA Mièja vida MD ED (MeV) PD
79Br 50.69% Br es estable amb 44 neutrons
81Br 49.31% Br es estable amb 46 neutrons
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