Barium Elemental Symbol

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Barium Barium Bario Bário Bario Barium

Barium(Ba) and molecular weight, atomic number and elemental symbolBarium is a Block S, Group 2, Period 6 element. Elemental BariumThe number of electrons in each of Barium's shells is 2, 8, 18, 18, 8, 2 and its electron configuration is [Xe] 6s2. Barium Bohr ModelBarium is a member of the alkaline-earth metals. The barium atom has a radius of and its Van der Waals radius is In its elemental form, CAS 7440-39-3, barium has a silvery-gray appearance. The main commercial source of barium is barite, BaSO4. Barium was discovered by Carl Wilhelm Scheele in 1772 and first isolated by Humphry Davy in 1808.

Barium has applications in glass, electronics, medicine, paints and colorants. Barium has long been used in medical diagnostic techniques because it makes a good x-ray contrast medium. Electronic coatings based on barium titanate are essential to cell phones and other microelectronics. High Purity (99.999%) Barium (Ba)Sputtering TargetHigh Purity (99.9999%) Barium Oxide (BaO) Powder Barium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity). Elemental or metallic forms include pellets, rod, wire and granules for evaporation source material purposes. Barium nanoparticles and nanopowders provide ultra-high surface area which nanotechnology research and recent experiments demonstrate function to create new and unique properties and benefits. Oxides are available in powder and dense pellet form for such uses as optical coating and thin film applications. Oxides tend to be insoluble. Fluorides are another insoluble form for uses in which oxygen is undesirable such as metallurgy, chemical and physical vapor deposition and in some optical coatings. Barium is also available in soluble forms including chlorides, nitrates and acetates. These compounds can be manufactured as solutions at specified stoichiometries.

Barium powder can ignite spontaneously in air, and when Barium compounds are water or acid soluble, they are very poisonous. Safety data for Barium and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the Products tab below.

  • Properties
  • Safety Data
  • Products
  • Research
  • Isotopes
  • Other Elements

Barium Properties

Symbol: Ba Melting Point: 727 oC, 1340.6 oF, 1000.15 K
Atomic Number: 56 Boiling Point: 1845 oC, 3353 oF, 2118.15 K
Atomic Weight: 137.3 Density: 3.5 gm/cc
Element Category: alkaline earth metals Liquid Density @ Melting Point: 3.338 g·cm−3
Group, Period, Block: 2, 6, s Specific Heat: 0.046 Cal/g/K @ 25 °C
    Heat of Vaporization 150.9 kJ mol-1
CHEMICAL STRUCTURE Heat of Fusion 7.66 kJ mol-1
Electrons: 56 Thermal Conductivity: 20.184 W/cm/K @ 298.2 K
Protons: 56 Thermal Expansion: (25 °C) 20.6 µm·m−1·K−1
Neutrons: 81 Electrical Resistivity: (20 °C) 332 nΩ·m
Electron Configuration: [Xe]6s2 Electronegativity: 0.9 Paulings
Atomic Radius: 222 pm Tensile Strength: N/A
Covalent Radius: 215±11 pm Molar Heat Capacity: 28.07 J·mol−1·K−1
Van der Waals radius: 268 pm Young's Modulus: 13 GPa
Oxidation States: 2 Shear Modulus: 4.9 GPa
Phase: Solid Bulk Modulus: 9.6 GPa
Crystal Structure: body-centered cubic Poisson Ratio: N/A
Magnetic Ordering: paramagnetic Mohs Hardness: 1.25
1st Ionization Energy: 502.86 kJ mol-1 Vickers Hardness: N/A
2nd Ionization Energy: 965.24 kJ mol-1 Brinell Hardness: N/A
3rd Ionization Energy: N/A Speed of Sound: (20 °C) 1620 m·s−1
CAS Number: 7440-39-3 Abundance in typical human body, by weight: 300 ppb
ChemSpider ID: 4511436 Abundance in typical human body, by atom: 14 ppb
PubChem CID: 5355457 Abundance in universe, by weight: 10 ppb
MDL Number: MFCD00134031 Abundance in universe, by atom: 0.09 ppb
EC Number: 231-149-1 Discovered By: Carl Wilhelm Scheele
Beilstein Number: N/A Discovery Date: 1772
SMILES Identifier: [Ba]  
InChI Identifier: InChI=1S/Ba Other Names: Bario

Health, Safety & Transportation Information for Barium

Material Safety Data Sheet MSDS
Signal Word Danger
Hazard Statements H261-H315-H319-H335
Hazard Codes F,Xi
Risk Codes 11-14/15-36/37/38
Safety Precautions 16-26-36/37-43
RTECS Number CQ8370000
Transport Information UN 1400 4.3/PG 2
WGK Germany 3
Globally Harmonized System of
Classification and Labelling (GHS)
Exclamation Mark-Acute Toxicity Flame-Flammables  

Barium Products

Metal Forms  •  Compounds  •  Alloys  •  Oxide Forms  •  Organometallic Compounds
Sputtering Targets  •  Nanomaterials  •  Semiconductor Materials •  Isotopes


Barium 135 Metal Isotope
Barium 136 Metal Isotope
Barium 137 Metal Isotope
Barium 135 Carbonate Isotope
Barium 137 Carbonate Isotope


Barium Acetate
Barium Acetate Solution
Barium Aluminate
Barium Aluminide
Barium Arsenate
Barium Boride
Barium Bromate
Barium Bromide
Barium Bromide Dihydrate
Barium Calcium Tungsten Oxide
Barium Carbide
Barium Carbonate
Barium Chlorate
Barium Chloride
Barium Chloride Dihydrate
Barium Chloride, Ultra Dry
Barium Chloride Solution
Barium Chromate(V)
Barium Chromate
Barium Dodecairon Nonadecaoxide
Barium Ferrite
Barium Fluoride
Barium Fluoride Granule
Barium Fluoride Pieces
Barium Fluoride, Ultra Dry
Barium Fluoride Window
Barium Fluorosilicate
Barium Hafnium Oxide
Barium Hexafluorophosphate
Barium Hydride
Barium Hydroxide
Barium Hydroxide Hydrate
Barium Hydroxide Monohydrate
Barium Hydroxide Octahydrate
Barium Iodate
Barium Iodide
Barium Iodide, Ultra Dry
Barium Iron Oxide
Barium Manganate
Barium Metaborate Monohydrate
Barium Metaphosphate
Barium Molybdate
Barium Niobate
Barium Nitrate
Barium Nitrate Hydrate
Barium Nitrate Solution
Barium Nitride
Barium Oxide
Barium Perchlorate
Barium Perchlorate Hydrate
Barium Permanganate
Barium Peroxide
Barium Phosphate
Barium Pyrophosphate
Barium Ruthenate
Barium Selenate
Barium Selenite
Barium Silicate
Barium Silicide
Barium Sodium Niobium Oxide
Barium Stannate
Barium Strontium Niobium Oxide
Barium Strontium Titanate
Barium Strontium Titanium Oxide
Barium Titanate
Barium Sulfate
Barium Sulfate Solution
Barium Tantalum Oxide
Barium Tetrafluorocobaltate
Barium Tetrafluoronickelate
Barium Tetratitanate BaTi4O9
Barium Titanate(IV) BaTiO3
Compounds, Continued

Barium Titanate BaTi2O5
Barium Tungstate
Barium Yttrium Tungsten Oxide
Barium Zirconate
Beta-Barium Borate
Lithopone - barium sulfate/zinc sulfide
Praseodymium Barium Copper Oxide
Strontium Barium Niobate
Yttrium Barium Copper Oxide
Yttrium-doped Barium Cerate

Crystal/ Semiconductor Materials

Barium Antimonide
Barium Arsenide
Barium Fluoride Lenses
Barium Fluoride Prisms
Barium Magnesium Aluminate, Europium doped
Barium Phosphide
Barium Selenide
Barium Sulfide
Barium Telluride
Potassium Niobate/Barium Nickel Niobate

Sputtering Targets

Barium Cerium Yttrium Zirconate Sputtering Target
Barium Ferrite Sputtering Target
Barium Fluoride Sputtering Target
Barium Oxide Rotatable Sputtering Target
Barium Oxide Sputtering Target
Barium Rotatable Sputtering Target
Barium Sputtering Target
Barium Strontium Titanate Sputtering Target
Barium Sulfide Sputtering Target
Barium Titanate Sputtering Target
Barium Zirconate Sputtering Target
Praseodymium Barium Copper Oxide Sputtering Target
Yttrium Barium Cuprate Sputtering Target

Oxide Forms

Barium Iron Oxide Nanopowder
Barium Oxide Pellets
Barium Oxide Pieces
Barium Oxide Powder
Barium Oxide Rotatable Sputtering Target
Barium Oxide Shot
Barium Oxide Sputtering Target
Barium Oxide Tablets

Organometallic Compounds

Barium 2-Ethylhexanoate
Barium Acetylacetonate
Barium Acetylacetonate Hydrate
Barium bis(trifluoromethylsulfonyl)imide
Barium Cyclohexanebutyrate
Barium Diphenylaminesulfonate
Barium Ethoxide
Barium Isopropoxide
Barium Naphthenate
Barium Oxalate
Barium Stearate
Barium Tartrate
Barium tetracyanoplatinate(II) Tetrahydrate
Barium Trifluoromethanesulfonate
D-Ribose-5-phosphate barium salt hexahydrate, 99%
D-Sorbitol 6-Phosphate Barium Salt
Prephenic Acid Barium Salt
Triethanolamine Aluminate Barium Salt

Recent Research & Development for Barium

  • Barium recovery by crystallization in a fluidized-bed reactor: Effects of pH, Ba/P molar ratio and seed. Su CC, Reano RL, Dalida ML, Lu MC. Chemosphere. 2014.
  • Barium chloride impaired Kir2.1 inward rectification in its stably transfected HEK 293 cell lines. Shen N, Zheng J, Liu H, Xu K, Chen Q, Chen Y, Shen Y, Jiang L, Chen Y. Eur J Pharmacol. 2014.
  • Structural and optical properties of Er(3+)/Yb(3+) doped barium titanate phosphor prepared by co-precipitation method. Mahata MK, Kumar K, Rai VK. Spectrochim Acta A Mol Biomol Spectrosc. 2014.
  • One- and two-particle effects in the electronic and optical spectra of barium fluoride. Cadelano E, Furthmüller J, Cappellini G, Bechstedt F. J Phys Condens Matter. 2014 Mar.
  • Dielectric properties of barium titanate supramolecular nanocomposites. Lee KH, Kao J, Parizi SS, Caruntu G, Xu T. Nanoscale. 2014.
  • Lightweight Bilayer Barium Sulfate-Bismuth Oxide Composite Thyroid Collars for Superior Radiation Protection in Fluoroscopy-guided Interventions: A Prospective Randomized Controlled Trial. Uthoff H, Benenati MJ, Katzen BT, Peña C, Gandhi R, Staub D, Schernthaner M. Radiology. 2014 Feb.
  • Surface-Initiated Polymerization from Barium Titanate Nanoparticles for Hybrid Dielectric Capacitors. Paniagua SA, Kim Y, Henry K, Kumar R, Perry JW, Marder SR. ACS Appl Mater Interfaces. 2014 Feb.
  • Transformation of Barium-Titanium Chloro-Alkoxide Compound to BaTiO3 Nanoparticles by BaCl2 Elimination. Kosinska-Klähn M, John L, Drag-Jarzabek A, Utko J, Petrus R, Jerzykiewicz LB, Sobota P. Inorg Chem. 2014 Feb.
  • Barium recovery by crystallization in a fluidized-bed reactor: Effects of pH, Ba/P molar ratio and seed. Su CC, Reano RL, Dalida ML, Lu MC. Chemosphere. 2014 Jan.
  • Rhodium-Doped Barium Titanate Perovskite as a Stable p-Type Semiconductor Photocatalyst for Hydrogen Evolution under Visible Light. Maeda K. ACS Appl Mater Interfaces. 2014 Jan.
  • Enantiomeric Separations of Chiral Sulfonic and Phosphoric Acids with Barium-Doped Cyclofructan Selectors via an Ion Interaction Mechanism. Smuts JP, Hao XQ, Han Z, Parpia C, Krische MJ, Armstrong DW. Anal Chem. 2014 Jan.
  • Radium and Barium Removal through Blending Hydraulic Fracturing Fluids with Acid Mine Drainage. Kondash AJ, Warner NR, Lahav O, Vengosh A. Environ Sci Technol. 2014 Jan.
  • Structural and optical properties of Er3+/Yb3+ doped barium titanate phosphor prepared by co-precipitation method. Mahata MK, Kumar K, Rai VK. Spectrochim Acta A Mol Biomol Spectrosc. 2014 Jan.
  • Barium Peritonitis in Small Animals. Ko JJ, Mann FA. J Vet Med Sci. 2014 Jan.
  • Synthesis, characterization and reactivity of potassium and barium complexes containing phosphane-borane stabilized methanides. Langer J, Görls H. Dalton Trans. 2014 Jan.
  • Molecular Structural Transformations Induced by Spatial Confinement in Barium Fluoride Cells. Vijay R, Polavarapu PL. J Phys Chem A. 2013 Dec.
  • Poly(vinylidene-trifluoroethylene)/ barium titanate composite for in vivo support of bone formation. Lopes HB, Santos TD, de Oliveira FS, Freitas GP, de Almeida AL, Gimenes R, Rosa AL, Beloti MM. J Biomater Appl. 2013.
  • Coating barium titanate nanoparticles with polyethylenimine improves cellular uptake and allows for coupled imaging and gene delivery. Dempsey C, Lee I, Cowan KR, Suh J. Colloids Surf B Biointerfaces. 2013 Dec.
  • Incidence of clinically silent malrotation detected on barium swallow examination in children. Atkin KL, Chowdhury MM, Bartlett M. J Med Imaging Radiat Oncol. 2013 Dec.
  • Effect of barium ferrite particle size on detachment efficiency in magnetophoretic harvesting of oleaginous Chlorella sp. Seo JY, Lee K, Lee SY, Jeon SG, Na JG, Oh YK, Park SB. Bioresour Technol. 2013 Dec.
  • Lightweight Bilayer Barium Sulfate-Bismuth Oxide Composite Thyroid Collars for Superior Radiation Protection in Fluoroscopy-guided Interventions: A Prospective Randomized Controlled Trial. Uthoff H, Benenati MJ, Katzen BT, Peña C, Gandhi R, Staub D, Schernthaner M.
  • High-sensitivity accelerometer composed of ultra-long vertically aligned barium titanate nanowire arrays. Koka A, Sodano HA. Nat Commun. 2013 Nov.

Barium Isotopes

Barium has six stable isotopes: 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, and 138Ba.

Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
132Ba 131.9050613 Observationally Stable 0+
134Ba 133.9045084 Stable 0+
135Ba 134.9056886 Stable 3/2+
136Ba 135.9045759 Stable 0+
137Ba 136.9058274 Stable 3/2+
138Ba 137.9052472 Stable 0+