CAS Number7440-64-4
PubChem CID23992
Atomic Radius176
Atomic Volume24.79
Atomic Weight173.054
Boiling Point1,196
Bulk Modulus
Crystal StructureFace Centered Cubic
Covalent Radius187
Electrical Resistivity
Electron Configuration[Xe] 4f14 6s2
Electrons per shell2, 8, 18, 32, 8, 2
Heat of Fusion7.7
Heat of Vaporization160
Ionization Potential6.254
Magnetic Ordering
Magnetic Susceptibility
Mass Number70
Melting Point824
Atomic Number173
Oxidation States2, 3
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.155
Thermal Conductivity0.349
Van der Waals radius
Young's Modulus
Abundance in Earth's crust0.00028%
Abundance in Universe2×10-7%
Yb Ytterbium 70 173.04 6 f 70 819.0 1196.0 [Xe] 4f14 6s2 2 8 18 32 8 2 6.97 0.00028% Silver Cubic: Face centered {"1":"603.4","2":"1174.8","3":"2417","4":"4203"} 603 50 +3,2 1.94 24.8 7.7 128.0 0.155 34.9 0 Solid, Conductor, Lanthanide, Stable, Natural i-TUR-bi-em Silvery, lustrous, malleable, and ductile metal. Used in metallurgical and chemical experiments. Found in minerals such as yttria, monazite, gadolinite, and xenotime. Monazite is often 50% rare earth by weight and typically 0.03% ytterbium. Rp7-yNvOV4I Ytterbium
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. From the Greek word barys, heavy 70 1878 Jean de Marignac Switzerland Named after the village of "Ytterby" near Vaxholm in Sweden

Isotopes of Barium

Standard Atomic Weight


Stable Isotopes

168Yb 170Yb 171Yb 172Yb 173Yb 174Yb 176Yb

Unstable Isotopes

148Yb 149Yb 150Yb 151Yb 152Yb 153Yb 154Yb 155Yb 156Yb 157Yb 158Yb 159Yb 160Yb 161Yb 162Yb 163Yb 164Yb 165Yb 166Yb 167Yb 169Yb 175Yb 177Yb 178Yb 179Yb 180Yb 181Yb

Water-soluble barium compounds are poisonous
At low doses, barium acts as a muscle stimulant
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.