Barium
56
Ba
Gruppe
2
Periode
6
Blokk
s
Protoner
Elektroner
Nøytroner
56
56
81
Generelle egenskaper
Atomnummer
56
Atomvekt
137,327
Massetall
137
Kategori
Jordalkalimetaller
Farge
Sølv
Radioaktiv
Nei
From the Greek word barys, heavy
Krystallstruktur
Body Centered Cubic
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.
Elektroner per energinivå
2, 8, 18, 18, 8, 2
Elektronkonfigurasjon
[Xe] 6s2
At low doses, barium acts as a muscle stimulant
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
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
Fordampningsvarme
140 kJ/mol
Spesifikk varmekapasitet
0,204 J/g·K
Forekomst i jordskorpa
0,034%
Forekomst i universet
1×10-6%
CAS Number
7440-39-3
PubChem CID Number
5355457
Atomegenskaper
Atomradius
222 pm
Kovalent radius
215 pm
Elektronegativitet
0,89 (Pauling-skalaen)
Ioniseringsenergi
5,2117 eV
Molart volum
39,24 cm3/mol
Termisk ledningsevne
0,184 W/cm·K
Oksidasjonstilstander
2
Bruksområder
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
Isotoper
Stabile isotoper
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138BaUstabile isotoper
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