Barium
56
Ba
Gruppe
2
Periode
6
Blokk
s
Proton
Elektron
Nøytron
56
56
81
Generelle eigenskapar
Atomnummer
56
Atommasse
137,327
Massetal
137
Kategori
Jordalkalimetall
Farge
Sølv
Radioaktiv
Nei
From the Greek word barys, heavy
Krystallstruktur
Romsentrert kubisk
Historie
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.
Elektron per energinivå
2, 8, 18, 18, 8, 2
Elektronkonfigurasjon
[Xe] 6s2
At low doses, barium acts as a muscle stimulant
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
3,594 g/cm3
Smeltepunkt
1000,15 K | 727 °C | 1340,6 °F
Kokepunkt
2170,15 K | 1897 °C | 3446,6 °F
Smeltevarme
8 kJ/mol
Fordampingsvarme
140 kJ/mol
Spesifikk varmekapasitet
0,204 J/g·K
Førekomst i jordskorpa
0,034%
Førekomst i universet
1×10-6%
CAS-nummer
7440-39-3
PubChem CID-nummer
5355457
Atom eigenskapar
Atomradius
222 pm
Kovalent radius
215 pm
Elektronegativitet
0,89 (Paulings skala)
Ioniseringspotensial
5,2117 eV
Molart volum
39,24 cm3/mol
Termisk konduktivitet
0,184 W/cm·K
Oksidasjonstrinn
2
Bruksområde
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
Isotopar
Stabile isotopar
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138BaUstabile isotopar
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