Barium

56
Ba
Gruppe
2
Periode
6
Blokk
s
Protons
Electrons
Neutrons
56
56
81
Generelle eigenskapar
Atomnummer
56
Atommasse
137,327
Mass Number
137
Kategori
Jordalkalimetall
Farge
Silver
Radioactive
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.
Elektron per energinivå
2, 8, 18, 18, 8, 2
Elektronkonfigurasjon
[Xe] 6s2
Ba
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
Abundance in Earth's crust
0,034%
Abundance in Universe
1×10-6%
Barium
Image Credits: Images-of-elements
Barium with a grey oxide layer under argon
CAS Number
7440-39-3
PubChem CID Number
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
Applications
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.
Water-soluble barium compounds are poisonous
Isotopes
Stable Isotopes
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138Ba
Unstable Isotopes
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