Barium

56
Ba
Grupp
2
Period
6
Block
s
Protoner
Electrons
Neutroner
56
56
81
Generella Egenskaper
Atomnummer
56
Atommassa
137,327
Mass Number
137
Kategori
Alkaliska jordmetaller
Färg
Silver
Radioaktiv
Nej
From the Greek word barys, heavy
Kristallstruktur
Rymdcentrerat kubisk
Historia
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.
Elektroner per skal
2, 8, 18, 18, 8, 2
Elektronkonfiguration
[Xe] 6s2
Ba
At low doses, barium acts as a muscle stimulant
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
3,594 g/cm3
Smältpunkt
1000,15 K | 727 °C | 1340,6 °F
Kokpunkt
2170,15 K | 1897 °C | 3446,6 °F
Smältvärme
8 kJ/mol
Ångbildningsvärme
140 kJ/mol
Specifik värmekapacitet
0,204 J/g·K
Abundance in Earth's crust
0,034%
Abundance in Universe
1×10-6%
Barium
Bildkrediter: Images-of-elements
Barium with a grey oxide layer under argon
CAS Number
7440-39-3
PubChem CID Number
5355457
Atomära Egenskaper
Atomradie
222 pm
Kovalent radie
215 pm
Elektronegativitet
0,89 (Paulingskalan)
Jonisationspotential
5,2117 eV
Molvolym
39,24 cm3/mol
Värmeledningsförmåga
0,184 W/cm·K
Oxidationstillstånd
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
Isotoper
Stabila isotoper
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138Ba
Instabila 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