Barium
56
Ba
Groep
2
Periode
6
Blok
s
Protonen
Elektronen
Neutronen
56
56
81
Algemene Eigenschappen
Atoomnummer
56
Atomair gewicht
137,327
Massa Getal
137
Categorie
Aardalkalimetalen
Kleur
Zilver
Radioactief
Nee
From the Greek word barys, heavy
Kristalstructuur
Ruimtelijk-gecentreerde Kubus
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.
Eletronen per schil
2, 8, 18, 18, 8, 2
Electronconfiguratie
[Xe] 6s2
At low doses, barium acts as a muscle stimulant
Fysieke Eigenschappen
Fase
Vast
Dichtheid
3,594 g/cm3
Smeltpunt
1000,15 K | 727 °C | 1340,6 °F
Kookpunt
2170,15 K | 1897 °C | 3446,6 °F
Fusiewarmte
8 kJ/mol
Verdampingswarmte
140 kJ/mol
Specifieke Warmtecapaciteit
0,204 J/g·K
Overvloedig aanwezig in de aardkorst
0,034%
Overvloedig aanwezig in het universum
1×10-6%
CAS-nummer
7440-39-3
PubChem CID nummer
5355457
Atoomeigenschappen
Atoomstraal
222 pm
Covalentiestraal
215 pm
Electronegativiteit
0,89 (Pauling schaal)
Ionisatiepotentiaal
5,2117 eV
Atoomvolume
39,24 cm3/mol
Thermische geleiding
0,184 W/cm·K
Oxidatietoestanden
2
Toepassingen
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
Isotopen
Stabiele isotopen
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138BaInstabiele isotopen
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