Bari
56
Ba
Grup
2
Període
6
Bloc
s
Protons
Electrons
Neutrons
56
56
81
Propietats Generals
Nombre atòmic
56
Massa atòmica
137,327
Nombre de massa
137
Categoria
Alcalinoterris
Color
Plata
Radioactiu
No
From the Greek word barys, heavy
Estructura cristal·lina
Cos cúbic centrat
Història
Barium was identified as a new element in 1774 by Carl Wilhelm Scheele.
Barium was first isolated by electrolysis of molten barium salts in 1808, by Sir Humphry Davy in England.
Robert Bunsen and Augustus Matthiessen obtained pure barium by electrolysis of a molten mixture of barium chloride and ammonium chloride.
Barium was first isolated by electrolysis of molten barium salts in 1808, by Sir Humphry Davy in England.
Robert Bunsen and Augustus Matthiessen obtained pure barium by electrolysis of a molten mixture of barium chloride and ammonium chloride.
Electrons per capa
2, 8, 18, 18, 8, 2
Configuració electrònica
[Xe] 6s2
At low doses, barium acts as a muscle stimulant
Propietats Físiques
Fase
Sòlid
Densitat
3,594 g/cm3
Punt de fusió
1000,15 K | 727 °C | 1340,6 °F
Punt d'ebullició
2170,15 K | 1897 °C | 3446,6 °F
Entalpia de fusió
8 kJ/mol
Entalpia de vaporització
140 kJ/mol
Capacitat tèrmica específica
0,204 J/g·K
Abundància a l'escorça terrestre
0,034%
Abundància a l'univers
1×10-6%
Número CAS
7440-39-3
Número CID de PubChem
5355457
Propietats Atòmiques
Radi atòmic
222 pm
Radi covalent
215 pm
Electronegativitat
0,89 (Escala de Pauling)
Potencial d'ionització
5,2117 eV
Volum atòmic
39,24 cm3/mol
Conductivitat tèrmica
0,184 W/cm·K
Estats d'oxidació
2
Aplicacions
Barium is used as a flashed getter in vacuum tubes to remove the last traces of gases.
It is often used in barium-nickel alloys for spark plug wire.
Barium sulfate is important to the petroleum industry as a drilling fluid in oil and gas wells.
Barium is also used in medicine to detect abnormalities in the digestive system.
It is often used in barium-nickel alloys for spark plug wire.
Barium sulfate is important to the petroleum industry as a drilling fluid in oil and gas wells.
Barium is also used in medicine to detect abnormalities in the digestive system.
Water-soluble barium compounds are poisonous
Isòtops
Isòtops estables
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138BaIsòtops inestables
114Ba, 115Ba, 116Ba, 117Ba, 118Ba, 119Ba, 120Ba, 121Ba, 122Ba, 123Ba, 124Ba, 125Ba, 126Ba, 127Ba, 128Ba, 129Ba, 131Ba, 133Ba, 139Ba, 140Ba, 141Ba, 142Ba, 143Ba, 144Ba, 145Ba, 146Ba, 147Ba, 148Ba, 149Ba, 150Ba, 151Ba, 152Ba, 153Ba