Barij

56
Ba
Skupina
2
Perioda
6
Blok
s
Protons
Electrons
Neutrons
56
56
81
General Properties
Vrstno število
56
Atomska teža
137,327
Mass Number
137
Kategorija
Zemljoalkalijske kovine
Barva
Silver
Radioactive
Ne
From the Greek word barys, heavy
Kristalna struktura
Telesno centrirana kubična
Zgodovina
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.
Electrons per shell
2, 8, 18, 18, 8, 2
Razporeditev elektronov
[Xe] 6s2
Ba
At low doses, barium acts as a muscle stimulant
Physical Properties
Faza snovi
Trdnina
Gostota
3,594 g/cm3
Tališče
1000,15 K | 727 °C | 1340,6 °F
Vrelišče
2170,15 K | 1897 °C | 3446,6 °F
Talilna toplota
8 kJ/mol
Izparilna toplota
140 kJ/mol
Toplotna kapaciteta
0,204 J/g·K
Abundance in Earth's crust
0,034%
Abundance in Universe
1×10-6%
Barium
Zasluge za slike: Images-of-elements
Barium with a grey oxide layer under argon
CAS Number
7440-39-3
PubChem CID Number
5355457
Atomic Properties
Atomski polmer
222 pm
Kovalentni polmer
215 pm
Elektronegativnost
0,89 (Paulingova lestvica)
Ionization Potential
5,2117 eV
Atomic Volume
39,24 cm3/mol
Toplotna prevodnost
0,184 W/cm·K
Oksidacijska stanja
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