Бариум

56
Ba
Група
2
Периода
6
блок
s
Protons
Electrons
Neutrons
56
56
81
Општи Својства
Атомски број
56
Атомска тежина
137,327
Mass Number
137
Category
Земноалкален метал
Color
Silver
Radioactive
Не
From the Greek word barys, heavy
Кристална структура
Body Centered Cubic
History
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
Електронска конфигурација
[Xe] 6s2
Ba
At low doses, barium acts as a muscle stimulant
Физички Својства
Фаза
Solid
Густина
3,594 g/cm3
Точка на топење
1000,15 K | 727 °C | 1340,6 °F
Точка на вриење
2170,15 K | 1897 °C | 3446,6 °F
Топлина на топење
8 kJ/mol
Топлина на испарување
140 kJ/mol
Specific Heat Capacity
0,204 J/g·K
Abundance in Earth's crust
0,034%
Abundance in Universe
1×10-6%
Barium
Кредити на слика: Images-of-elements
Barium with a grey oxide layer under argon
CAS Number
7440-39-3
PubChem CID Number
5355457
Атомски Својства
Атомски полупречник
222 pm
Ковалентен полупречник
215 pm
Електронегативност
0,89 (Полингова скала)
Ionization Potential
5,2117 eV
Atomic Volume
39,24 cm3/mol
Thermal Conductivity
0,184 W/cm·K
Oxidation States
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