Barij
56
Ba
Skupina
2
Perioda
6
Blok
s
Protoni
Elektroni
Nevtroni
56
56
81
Splošne lastnosti
Vrstno število
56
Atomska teža
137,327
Masno število
137
Kategorija
Zemljoalkalijske kovine
Barva
Srebrna
Radioaktivno
Ne
From the Greek word barys, heavy
Kristalna struktura
Telesno centrirana kubična
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 18, 8, 2
Razporeditev elektronov
[Xe] 6s2
At low doses, barium acts as a muscle stimulant
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
3,594 g/cm3
Tališče
1000,15 K | 727 °C | 1340,6 °F
Vrelišče
2170,15 K | 1897 °C | 3446,6 °F
Talilna toplota
8 kJ/mol
Izparilna toplota
140 kJ/mol
Toplotna kapaciteta
0,204 J/g·K
Zastopanost v Zemljini skorji
0,034%
Zastopanost v vesolju
1×10-6%
CAS številka
7440-39-3
PubChem CID številka
5355457
Atomske lastnosti
Atomski polmer
222 pm
Kovalentni polmer
215 pm
Elektronegativnost
0,89 (Paulingova lestvica)
Ionizacijski potencial
5,2117 eV
Atomski volumen
39,24 cm3/mol
Toplotna prevodnost
0,184 W/cm·K
Oksidacijska stanja
2
Uporabe
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
Izotopi
Stabilni izotopi
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138BaNestabilni izotopi
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